Option (A) $\dfrac{1}{7}$
Multiples of 7 from 1 to 40 are: 7, 14, 21, 28, 35 → 5 outcomes.
Total outcomes = 40.
P = $\dfrac{5}{40} = \dfrac{1}{8}$
Correct answer: B $\dfrac{1}{8}$
Count multiples of 7 up to 40 carefully: 7×1=7, 7×2=14, 7×3=21, 7×4=28, 7×5=35 — that's exactly 5. Dividing 5/40 simplifies to 1/8. Option A (1/7) is a common error from mistakenly using 7 as the numerator. Always list and count favourable outcomes before applying the formula.