Provided answer (B) is correct.
"The access point is downgraded to 3x3 when it is connected to a 15.4W supply. For the access point to operate at its full potential, using an 802.3at PoE switch or AIR-PWRINJ4 power injector is recommended."
https://www.cisco.com/c/en/us/td/docs/wireless/access_point/3700/quick/guide/ap3700getstart.html#pgfId-42186
The access point is downgraded to 3x3 when it is connected to a 15.4W supply
802.3af - IEEE 802.3af-2003 PoE standard provides up to 15.4 W of DC power
802.3af delivers 15.4W which downgrades the AP to 3x3. If it was a POE+ switch then you would get 30W of power and the AP would be able to use it's full features but the question is only asking about 3x3 MIMO.
https://www.cisco.com/c/en/us/td/docs/wireless/access_point/3700/quick/guide/ap3700getstart.html
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