I believe that the answer is C.
Let me know if something is mistaken. Here is the answer.
a, b & c are integers.
1. it mean that at least one of a, b or c is equal to 7
NOT SUFFICIENT
2. It means that b & c cant be 7 (because 18 has not integers factors that is equal to 7)
NOT SUFFICIENT
However, combining these two yields that only a can be 7. Hence C is the answer.
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