If an Adult Human Who Is in Nitrogen Balance Is

If an adult human who is in nitrogen balance is put on a diet deficient only in phenylalanine, which one of the following statements will be MOST CORRECT?

A) Nitrogen intake will continue to equal nitrogen excretion.
B) Nitrogen balance will temporarily become negative but the individual will adapt and nitrogen balance will gradually return to zero.
C) Nitrogen balance will become positive and remain that way as long as the deficiency exists.
D) Nitrogen balance will temporarily become positive but the individual will adapt and nitrogen balance will gradually return to zero.
E) Nitrogen balance will become negative and remain that way as long as the deficiency exists.