Answer:
B
Explanation:
Stage 1: 10 exterior faces
Stage 2: 18 exterior faces
Stage 3: 26 exterior faces
Difference between stage 2 and stage 1: 18 - 10 = 8
Difference between stage 3 and stage 3: 26 - 18 = 8
The constant difference is 8. The first term (Stage 1) is 10.
Answer: B