IMAT 2013 Q57 [Units of Power]

In the expressions below: g = gravitational acceleration; h = height; m = mass;
R = electrical resistance; t = time; v = velocity; V = voltage.

Which of the following expressions have units of power?

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A. 1 and 2 only
B. 1 only
C. 2 and 3 only
D. 1 and 3 only
E. 1, 2 and 3