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