Question

proteins owe all of their functionality to...
carbohydrates
dna
lipids

Explanation:

Proteins' functionality is determined by their structure, which is encoded in DNA (genetic material). DNA contains the instructions for synthesizing proteins with specific sequences (and thus structures) that give them their functions. Carbohydrates and lipids have different roles (energy, structure, signaling for carbs; energy storage, membrane structure for lipids) and don't directly determine protein functionality.

Answer:

B. DNA