If the water table rises upto ground surface, then the___________________?

A. effective stress is reduced due to decrease in total stress only but pore water pressure does not change
B. effective stress is reduced due to increase in pore water pressure only but total stress does not change
C. total stress is reduced due to increase in pore water pressure only but effec-tive stress does not change
D. total stress is increased due to de-crease in pore water pressure but effective stress does not change