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B is correct.
CHAPTER 5 - PAGE 173 and 175 (Official Study Guide)
173 --> "This PHY was made available through the 802.11a amendment in 1999."
175 --> "ERP is the first OFDM-based PHY that operates in 2.4 GHz, and OFDM is the first OFDM-based PHY that operates in 5 GHz. HT and VHT, explained later in this section, are both OFDM-based as well."
http://www.rhyshaden.com/802_11a.htm
OFDM is only used in 5Ghz transmissions. 802.11g ERP-OFDM, and 802.11n HT-OFDM are used in 2.4Ghz transmissions and are not specifically OFDM.
I think C is actually the right answer and this question is poorly worded. If they were actually wanting ERP- or HT- flavors of OFDM, I think they would have said it. I can't find any time where the 11g or 11n flavors were not specifically referred to as ERP or HT OFDM, whereas OFDM of the 11a flavor can only be described as OFDM.
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