This is an example of starch crops biomass feed stocks

The correct option is sugar cane.

Biomass feedstocks are organic materials that can be converted into energy or biofuels. They are generally categorized based on their chemical composition and the type of energy stored within them, such as starch, sugar, cellulose, or lipids.
Let's evaluate each option to understand why sugar cane is the correct choice under the starch and sugar crop category:

1. Sugar Cane: Sugar cane is a primary sugar crop. In the context of bioenergy and industrial classifications, sugar-producing crops and starch-producing crops (like corn or cassava) are closely grouped together because both yield soluble, simple sugars (either directly or via enzymatic breakdown of starch) that are easily fermented into ethanol. Therefore, sugar cane represents a classic example of this category of agricultural biomass feedstock.
2. Corn Stover, Wheat Straw, and Orchard Prunings: These feedstocks consist of the non-grain, woody, or fibrous parts of plants (such as stalks, leaves, and branches). They are composed primarily of cellulose, hemicellulose, and lignin. Consequently, they are classified as lignocellulosic biomass feedstocks, rather than starch or sugar crops.

Thus, among the choices provided, sugar cane is the correct example of a sugar/starch crop biomass feedstock.