The cell pressure and pore water pressure is increased from 0.1 N/sq. m to 0.26 N/sq. m and 0.07 N/sq. m to 0.15 N/sq. m respectively in the triaxial test. The Skempton’s pore pressure parameter is given by_____.

A

-3

B

-0.5

C

0.5

D

2