Alternative instructions for a single protein are encoded on:\nOptions:\n- (A) alleles\n- (B) Acids\n- (C) PDAs\n- (D) nucleus\n- (E) junk DNA\n- (F) A computer\n- (G) inheritance\n- (H) Tail
Let's be accurate as possible and think first.
(A)
Most genes contain the instructions for a single protein.

Alleles are alternative forms of a gene.

Alleles can contain instructions for making alternative versions of the same single protein.

.

Final answer: (A)