Retirement planners typically begin by looking at a client's sources of income, which is a chief key for predicting future cash flows.


(A) a client's sources of income, which is

(B) clients' sources of income, which is

(C) a client's sources of income, which are

(D) the income sources of a client, which is

(E) sources of a clientele's income, which are

OA C

Source: Economist Gmat