A baby girl weighed 18 lb 10 oz at 11 months and 20 lb 2 oz at 12 months. How much weight did the baby gain during this month?
(1 lb = 16 oz)

would it be 2lb 2oz???

or
A. 1 lb 2 oz
B. 1 lb 8 oz
C. 2 lb 2 oz
D. 2 lb 8 oz