Australia and new zealand experience many different climates. which of the following is one of them?

a. arid
b. polar
c. marine west coast
d. humid subtropical

"Marine West Coast" is another name for Oceanic Climate - and in fact, most of New Zealand has this climate! (and South -East of Austrialia).

However, if you take this name, as some do, to only refer to the US, then it does not apply.

One climate that Australia experiences is arid - in the deserts, so A is a correct answer!

They don't experience Polar climate, and since they also experience hummid subtropical, I think that the question had a "not"; in "is not one of them" - then the correct answer would be B.

So the answer is: they experience the climates in A, C, and D. but not the one in B.