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Which modulation spectrum has narrow main lobe?

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Which modulation spectrum has narrow main lobe?

(a) QPSK

(b) OQPSK

(c) BPSK

(d) MSK

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This interesting question is from Bandwidth Efficiency Plane and Bandwidth Efficient Modulation in portion Modulation and Coding Trade-off of Digital Communications

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Best answer
Right choice is (a) QPSK

Easiest explanation: QPSK has narrower main lobe than MSK because  for a given rate the QPSK symbol rate is half the MSK symbol rate.

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