Amy won 8 out of the 14 rounds of cards that she played. Which proportion can she use to find x, the percent of rounds that she lost?

Responses
A 614
= x100
6 14 = x 100
B 146
= x100
14 6 = x 100
C 6100
= x14
6 100 = x 14
D 814
= x100

6 14 = x 100

The correct proportion that Amy can use to find x, the percent of rounds that she lost, is option A:

6 14 = x 100