Which of the following would NOT be a benefit of purchasing call options for the stocks of a number of different companies?

[A] If the underlying stocks decline, the investor's losses would be limited to the amount of the premiums.
[*B] By exercising the calls early, the investor could limit the risk in his portfolio.
[C] If the underlying stocks moved upward, the investor could participate in this upward movement.
[D] Added diversification would be provided to the investor only until the calls expire.