How do we know that deceased travel times is an intended consequence? For all we know, the only intended consequence of this decision was to cut the cost of traffic lights or something random like that. This is why the question is so subjective. You simply cannot tell what is the unintended and intended consequences of this decision as we don’t have enough information.
I think they will accept C or D, but the ‘most right’ answer is C, as it there is little to no reasonable explanation as to why house prices would rise and hence it’s neither an unintended or intended consequence - if anything, it’s not even a consequence.
I wouldn’t fret about it, though. I wouldn’t even be surprised if NESA allow for all four answers. We have approximately 12 days until our ATARs are out and all HSC Eco marking would have been completed by now.
Nothing we can do about it now other than prey to the NESA gods.