What was the question for this implicit rationale, and corresponding answer?
Most invertebrates have a nervous system. Invertebrates are animals without a backbone. Most animals without backbones have a nervous system.
 The answer: (C)
The question: Which type of system do most animals without backbones have?
Options:
- (A) sensory neurons
- (B) Veins and arteries.
- (C) Nervous system
- (D) Stereo system
- (E) Root system
- (F) to move people
- (G) Skeletal system
- (H) insects