ICC test question:

Number 12 AWG THHN , copper conductors that are located in the attic and are part of the NM cable. The ambient temperature around the conductors will be 110F. The terminal devices are not rated for more than 60degrees C......What is the conductor ampacity for this condition?

A) 20
B) 26
C) 30
D) 35

I get 30 amps from table 3605.1.....the answer is B, 26 amps...what gives?

Thanks as always for your help.

Wen