The federal government of Australia has exclusive powers over all of the following, except , which is predominately the responsibility of the state governments.

A.
interstate trade
B.
defense
C.
foreign affairs
D.
primary education

I believe the correct answer is primary education.

Explanation:

The Australian government has three arms namely; the Federal government, State government, and the Local councils with their various functions in the country.  The Federal Government of Australia as provided in the Constitution is saddled with the responsibility of regulating foreign affairs, trade & commerce, defence, currency, immigration, etc. The State government, on the other hand, is responsible for Primary education, Health care, transportation, housing, etc.

It is D...

Explanation:

use wikipedia, i think they have this.