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Why is a cyclic prefix required in an OFDMA?

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Why is a cyclic prefix required in an OFDMA?

(a) To ensure symbol time is an integer number

(b) To help overcome multipath and ISI

(c) To maintain orthogonality

(d) To make OFDMA scalable

I had been asked this question in exam.

I need to ask this question from Orthogonal Frequency Division Multiple Access (OFDMA) topic in portion 4G of Wireless/Mobile

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Correct choice is (b) To help overcome multipath and ISI

Best explanation: Use of cyclic prefix is a key element of enabling the OFDM signal to operate reliably. The cyclic prefix acts as a buffer region or guard interval to protect the OFDM signals from intersymbol interference.

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