Answer and explanation

Correct answer: B.

  1. Step 1: Use substitution: let .
  2. Step 2: Change limits: when , ; when , .
  3. Step 3: Evaluate integral: .
Answer
\frac{1}{4}.
Why not the others: '' divides by 3 instead of 4; '' divides by 2; '' forgets the denominator.

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