Step 1: Pick out the clue.
Radha is intelligent, experienced and competent. She quickly changes sales plans to suit market changes.
So the clue is the quality of the sales manager.
Step 2: Recall the rule.
The textbook says that if managers are competent and innovative enough to start new sales plans and policies in tune with the market, the sales organisation would be large and complex.
Step 3: Apply the rule.
A capable manager can handle many products, many channels and many levels. So Zenith Ltd. would have a complex and large structure.
Step 4: Reject the other options.
(A) Small and complex: the textbook links competence with a large structure, not a small one.
(C) Large and simple: a competent manager leads to a complex structure, not a simple one.
(D) Simple and complex: these two words contradict each other.
Final Answer:
The structure of Zenith Ltd. would be complex and large, option (B).