Which option describes why most wireless phones and tablets do not use 802.11a/n and 40 MHz channels?

Which option describes why most wireless phones and tablets do not use 802.11a/n and 40 MHz channels?
A . a lack of radio range when using these radios
B . a lack of device battery capacity to operate concurrent a/b/g/n radios
C . a lack of cooling in the device necessary to operate these radios
D . These radios would require the devices to be larger.

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Answer: B