Assertion (A) Organisation Development (OD) is a planned effort and therefore requires a great deal of thinking and planning on the part of the OD expert. Knowledge and skills of the applied behavioural sciences are used in OD.
Reason (R) OD cannot succeed unless the people at the top are committed to what is being done. By definition, OD has a begin form the top.

A. (A) is correct, (R) is not correct

B. (R) is correct, (A) is not correct

C. Both (A) and (R) are correct, (R) explains (A)

D. Both (A) and (R) are correct, (R) does not explain (A)

Answer: Option D