Question

a. digestive
b. excretory
c. nervous
d. respiratory

Explanation:

To answer, we analyze each system:

• Digestive (A) processes food.
• Excretory (B) removes waste (like urea, excess water).
• Nervous (C) controls/coordinates via nerves.
• Respiratory (D) handles gas exchange (O₂/CO₂).

Assuming the question is about a system related to waste removal (common excretory context), or matching the intended topic. If the question (partially visible) is about a system like kidneys/urine, excretory fits. But since the full question is cut off, if we assume a typical question (e.g., "Which system removes waste?"), the answer is B. Excretory.

Answer:

B. excretory