I believe A is the most correct (i assume it's about antibiotics - they actually DO harm our immune system in some way).
B is partially correct because, the colds indeed should be treated by anti-viral medication (because the virus is a cause of typical cold) but using antibiotics during recovery is needed only when an additional bacterial infection occurs as a complication after the viral infection. and it doesn't happen very often.
C - what works? antibiotics doesn't work for viral infections (colds). anti-viral medication do.
D i won't discuss.
I am sorry for a so long answer. but your question is so linguistically twisted that i am not sure which of the following choices is actually correct because of a big amount of mistakes.
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Question:
Which subatomic particles are most important in the transfer of energy in living organisms?
Answer:
Electrons.
Extra Information:
An electron is an elementary particle having a charge of -1. It orbits the nucleus of atoms in shells (I.e., the K, L, M, N, O, P, etc.)
Answer:
Pressure is data on, well, pressure. Pain is data on damage being caused.
Answer:
What do you think of this
1. the plant produces the seed
2.pollen fertilizes the female part or the plant
3.the squirrel collects the seed
4. the squirrel buries the seed
5. squirrel doesn't come back for seed
6. a new plant grows