单项选择题
In square PQRS above.T is the midpoint of side RS.If PT=,What is the length of a side of the square()
A.A B.B C.C D.D E.E
A、 if the quantity in Column A is greater; B、 if the quantity in Column B is greater; C、 if the two quantities are equal; D、 if the relationship cannot be determined from the information given.