Meters (m) are a larger unit than centimeters (cm), so the appropriate conversions to larger units are ...
d. 50 cm = 0.50 m
f. 7 cm = 0.07 m
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In the case of b, 108 cm = 1.08 m. The given number is incorrect. Conversions c and e are from larger units to smaller ones (and e is incorrect; it has the numbers backward). "a" is just flat wrong: 2 ≠ 200.
If "f" really has no units specified for .07, then it is incorrect, too.