Answer:
C. C-B,
A. A-B,
D. B-S
Step-by-step explanation:
Given,
Total types of pie = 6 ( Cherry, Apple, Blueberry, Strawberry, Pumpkin, and Key Lime ),
For these pie we need to make any two types of pie,
Here, the order matters ( for example C-A and A-C are same )
So, the total possible ways of getting any two pies = 

= 15 ( C-A, C-B, C-S, C-P, C-K, A-B, A-S, A-P, A-K, B-S, B-P, B-K, S-P, S-K, P-K)
Hence, OPTIONS C, A and B are correct.