Correct answer: (C) Both Simpson’s 1/3 and trapezoidal rules are exact.
Explanation
The integrand is linear, so trapezoidal integration is exact; Simpson’s rule is exact for polynomials up to degree three. Ordinates are 7,9,11. Trapezoidal gives (7+2×9+11)/2 = 18; Simpson gives (7+4×9+11)/3 = 18, agreeing with the integral. **C**.
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