two biology questions. I just need some reinforcement. Thanks in Advance! :)?

[Nurse Major]

1) How do you tell when a cell is undergoing division?

a) mRNA molecules can be found inside the cytoplasm
b) alleles are forming new genes
c) proteins are being produced
d) the DNA is visible in chromosomes

2) Which of the following is/are true of oxidation and reduction?

A) a molecule which has gained an electron has been reduced.
B) If one molecule is oxidized, another must be reduced.
C) Oxygen is required for all oxidation reactions.
D) both A and B are true.

is C true? Im not sure that why im struggling with this question