Which of the following is not an autotroph?
a) hummingbird b) grass c) rose bush d)none of the above

Hummingbird. 

An autotroph[α] ("self-feeding", from the Greek autos "self" and trophe "nourishing") or "producer", is an organism that produces complex organic compounds (such as carbohydrates, fats, and proteins) from simple substances present in its surroundings, generally using energy from light (photosynthesis) or inorganic chemical reactions (chemosynthesis). They are the producers in a food chain, such as plants on land or algae in water, in contrast to heterotrophs as consumers of autotrophs

The right answer is c.sandstone.