Answer:
a. 72
Step-by-step explanation:
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Surface area = top & bottom, which are the same, and all 4 sides' areas added together:
top and bottom: each is 3 x 2 = 6 square cm, times 2 = 12 square cm.
two sides are 6 x 3 cm = 18, times 2 = 36 square cm
other two sides are 6 x 2 cm = 12, times 2 sides = 24 square cm
Add them all up: 12 + 36 + 24 = 72 square cm
