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Which modulation requires more bandwidth?

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Which modulation requires more bandwidth?

(a) QPSK

(b) OQPSK

(c) BPSK

(d) BFSK

This question was posed to me during an interview.

I need to ask this question from Bandwidth Efficiency Plane and Bandwidth Efficient Modulation in division Modulation and Coding Trade-off of Digital Communications

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Best answer
Right answer is (c) BPSK

For explanation I would say: BPSK requires more bandwidth than the other modulation techniques for the given level of spectral density.

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