Whats the answer O_O

I think its 4, like I'm 90%sure

4. Protein synthesis

Explanation:

structure A is the mitochondria where ATP is produce, also known as protein.

golgi body just took the test on edge

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds