Bob contributed to Alpha Corp a building with a basis of $50k and a FMV of $150k (subject to a mortgage of $120k) in exchange for 50% of the voting common stock of Alpha Corp (the only class of stock)

Which of the following code sections is or are relevant to the determination of whether or not Bob recognizes a gain or loss on this transaction?

A. Code Section 721

B. Code sections 1031 and 1001

C. Only Code section 1001

D. Code Sections 351 and 1001