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The correct answer is B.
According to standard III (B), members must deal fairly with all clients. By giving preferential treatment to his friend, Ronald violates the standard by being unfair to other clients.
The ‘buy’ recommendation is given by his company’s research team. Further, he himself reads the entire research thoroughly and is convinced that the stock is worth buying. Thus, he has a reasonable basis to buy the stock. Standard V (A) is not violated.