No ProductID is carried in the option's URL.
products_detail.php?ProductID=19
The product's first drop-down option was my attempt to prevent one from inadvertently adding to cart the wrong size (addressed in a different post).
Select any other option.
No image appears.
No price is carried over.
No ProductID is carried in the URL.
ProductID=
Therefore no more product info, no more image, no more price.