Q. The sensitivity of an outlet is defined as the ratio of the ?

(A) rate of change of discharge of an outlet to the rate of change of discharge of the distribution channel

(B) rate of change of discharge of an outlet to the rate of change in level of the distribution surface, referred to normal depth of the channel

(C) depth of the sill or the crest level of the module below the full supply of the distribution channel to the full supply depth of the distributing channel

(D) head recovered to the head put in an outlet