Detailed Instructions: In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.
Q: Problem: the diagonals of a rhombus are 16 cm and 20 cm . find its area ? 
Options: a ) 160 , b ) 288 , c ) 150 , d ) 238 , e ) 31
A:
a