Which of the following is TRUE regarding the translocation that occurs at the source and the sieve tube element according to the Pressure Flow hypothesis.

I. Sucrose diffuses from mesophyll cells into the sieve tube element
II. High concentration of sucrose in sieve tube lowers the water potential
III. Water from neighbouring cells enters the sieve tube by osmosis
IV. High hydrostatic pressure is created in the sieve tube

A. I and III

B. III and IV       

C. I, II and III

D. II, III and IV