Timothy runs a catering service for large parties. He needs 37 heads of lettuce for salad to feed 100 guests. Which of the following ratios illustrates how many heads of lettuce, x, he would need to feed 275 guests?

A.37/100=x/275
B.x/100=37/275
C.100/275+ x/37
D.100/37=x275

The correct ratio to represent how many heads of lettuce Timothy would need to feed 275 guests is:

A. 37/100 = x/275