(C) The positive multiples of $4$ are $4, 8, 12, 16, \dots$This forms an Arithmetic Progression $(A.P.)$ where the first term $a = 4$.The common diffe

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(C) The positive multiples of $4$ are $4, 8, 12, 16, \dots$This forms an Arithmetic Progression $(A.P.)$ where the first term $a = 4$.The common difference $d$ is calculated as the difference between any two consecutive terms:$d = a_2 - a_1 = 8 - 4 = 4$.Alternatively,$d = a_3 - a_2 = 12 - 8 = 4$.Thus,the common difference $d$ is $4$.