PQR is a triangle. S and T are the midpoints of the sides PQ and PR respectively. Which of the following is TRUE?
I. Triangle PST is similar to triangle PQR.
II. ST = $$\frac{1}{2}$$(QR)
III. ST is parallel to QR.

A

only I and II

B

only II and III

C

only I and III

D

All I, II and III