C) 52 m²
A = 2(lw + lh + wh)
l = 4m
w = 3m
h = 2m
A = 2(4m×3m + 4m×2m + 3m×2m)
= 2(12m² + 8m² + 6m²)
= 2×26m²
= 52m²
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