The first answer is A. Because carbon can bond with most any molecule, not just oxygen or hydrogen. Also, carbon can only form 4 bonds, not 5. And carbon atoms do not need to form hexagons.
The second answer is E. Because carbon atoms do not have to form a bond with hydrogen, and they can form up to four bonds. But these bonds are covalent, not ionic.
The third answer is B, I think. Because it is mainly only DNA and RNA that store and transmit genetic information.
It's either B or E on this last question, I'm not sure which though.
