atran,
Looks like it's just me 'n you on the "C" answer. Even though we're in the minority here I still think we got the 'right' one!
Let me take one more stab at my justification here ..
(b) It is required to be terminated at 60 degree C ampacity - not necessarily, .. right?
(c) It must have insulation rated 60 degree C ampacity. - yes, it must have insulation rated for at least 60C. (nothing lower in the table)
I'm done.
Bill