Answer:
The link reaction converts pyruvic acid to Acetyl-CoA.
I hope it's helpful!
The answer is B because:
Cell walls are made of cellulose and proteins (hence II).
Animal cells don't have cell walls (only cell membrane) but plant cells do so IV
They must be semipermeable since materials for example carbon dioxide and water for photosynthesis have to go into the cell <em>some</em> way.
Water because hydro means water
