34) B

Mass of fat taken in one day = 143g ≈ 140
Mass of fat that comes from vegetable oils = 30%
30% of 140 = 42 grams

Mass of Erucic acid in 100g canola oil = 0.6g
Mass of Erucic acid in 42g canola oil = (42/100) x 0.6 = 0.252g
PTDI value = 500mg = 0.5g
Percentage = (0.252/0.5) x 100 = 50.4%
This is roughly 52% so the answer is B

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