Organisms that make up the first level and produce their own food are classified as - a: predators b: autotrophs c: heterotrophs d: decomposers

The correct answer is autotrophs.  

Another way to say this is that they are "producers"

Just remember, the prefix "auto" means to one self, and "troph" means to get food from.

So, "autotroph" means to get food from oneself, whereas "heterotroph" means to get food from another.

the answer would be..

b. sucking