To solve this we are going to use the formula for the area of a rhombus:

where

is the area of the rhombus

is a diagonal of the rhombus

is a diagonal of the rhombus
We know from our problem that the diagonals of our rhombus are 14 cm and 12 cm, so

and

. Lets replace those values in our formula to find

:


We can conclude that the correct answer is:
84 square cm