Answers by visitors named: SAI

SORRY MAM I DID NOT UNDERSTAND SINCE THE ANSWER SHOULD BE AMONG THE BELOW : ANY ONE OPTION A. 2 1/6 B. 2 3/10 C. 2 1/3 D. 5 1/2
IN ANSWER BOOK IT SAYS OPTION B. 2 3/10 THATS WHY IAM CONFUSSED.
MAM CAN U PLS EXPLAIN ME BY SHOWING THE WORK PLEASE THANK YOU