The ratio of settlement at any time 't' to the final settlement, is known as

ANS:B - degree of consolidation

The options "Co-effeicent of consolidation" and "Consolidation index" depends upon the ratio of the initial and final settlement.

So degree of consolidation is the correct option. %U=h/H*100.

h = settlement occurred at any time.
H = final total settlement at the end. The ratio of settlement Of clay at a particular time to the final settlement when the process of consolidation is completed. Coefficient indicates that RATE by which soil sample is compressed and degree shows that the RATIO.