Which table shows a proportional relationship between xx and yy?
A
xx yy
55 77
77 99
2020 2222
2525 2727
B
xx yy
1010 3030
1414 4242
1818 5454
2727 8181
C
xx yy
55 1212
1919 5454
2222 6363
2929 8484
D
xx yy
55 33
1515 99
2020 1616
2525 1717