CORRECT!

9). Operation in which airspace requires filing an IFR flight plan?

a). Class E airspace with IMC and class A airspace.
b). Positive control area, Continental Control Area, and all other airspace, if the visibility is less than 1 mile.
c). Any airspace when the visibility is less than 1 mile.
The answer is:
a). Class E airspace with IMC and class A airspace.

Also regulatory. An IFR flight plan (and all of the associated pilot ratings, pilot currency and aircraft capabilities) is required in all controlled airspace when IMC exists. Class A is that airspace from 18,000 feet up to FL600 and ops in that airspace must be conducted on an IFR flight plan (other restrictions apply also).

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