Each number in the list below can be paired with a different number in the same list to make an integer product except for one number. What is the letter corresponding to the one exception?
A.\(\sqrt{40}\)
B. \(\sqrt{54}\)
C. \(\sqrt{60}\)
D. \(\sqrt{90}\)
E. \(\sqrt{96}\)
F. \(\sqrt{120}\)
G.\( \sqrt{135}\)