Create custom option programmatically in magento2

To create custom options in a product programmatically you need to use following code:

$objectManager = \Magento\Framework\App\ObjectManager::getInstance(); //instance of Object manager
        $productId = 50;
        $product = $objectManager->create('\Magento\Catalog\Model\Product')->load($productId);
        $values = [
            [
                'record_id'=>0,                                        
                'title'=>'Red',
                'price'=>10,
                'price_type'=>"fixed",
                'sort_order'=>1,
                'is_delete'=>0
            ],
            [
                'record_id'=>1,                    
                'title'=>'White',
                'price'=>10,
                'price_type'=>"fixed",
                'sort_order'=>1,
                'is_delete'=>0
            ],
            [
                'record_id'=>2,                    
                'title'=>'Black',
                'price'=>10,
                'price_type'=>"fixed",
                'sort_order'=>1,
                'is_delete'=>0
            ]
        ];
         
        $options = [
            [
                "sort_order"    => 1,
                "title"         => "Field Option",
                "price_type"    => "fixed",
                "price"         => "",
                "type"          => "field",
                "is_require"    => 0
            ],[
                "sort_order"    => 2,
                "title"         => "Color",
                "price_type"    => "fixed",
                "price"         => "",
                "type"          => "drop_down",
                "is_require"    => 0,
                "values"        => $values
            ],[
                "sort_order"    => 3,
                "title"         => "Multiple Option",
                "price_type"    => "fixed",
                "price"         => "",
                "type"          => "multiple",
                "values"        => $values,
                "is_require"    => 0
            ]
        ];
         
        $product->setHasOptions(1);
        $product->setCanSaveCustomOptions(true);
        foreach ($options as $arrayOption) {
            $option = $objectManager->create('\Magento\Catalog\Model\Product\Option')
                    ->setProductId($productId)
                    ->setStoreId($product->getStoreId())
                    ->addData($arrayOption);
            $option->save();
            $product->addOption($option);
        }

Here,

$values : is an array holds the values for the select type custom option.

$options: is an array holds multiple custom options.

Once this code is executed, the custom options of types: field, drop down and multi select are created in your product.

Screenshot: