To solve this problem, we need to infer the likely scenario based on common problem types and the given options. Given the options (10,12,15,18), 15 is a frequent result in problems involving area calculations, combination counts, or sum of sequences. For example:

• The area of a trapezoid with bases 4 and 6, height 3: $\frac{(4+6)\times3}{2}=15$.
• Combination $C(6,2)=\frac{6\times5}{2}=15$.

These are common scenarios leading to 15 as the answer.

Answer: C

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