What an ambiguous question. If it's a headwind on final at 2000ft, but a crosswind at ground level, there's a fair chance you also have a decrease in headwind component! But a "marked decrease in headwind"? Cannot say from that information. They'd be looking for answer 1 I'd say, but it's still a poor question.
Also, irrespective of sea breeze, wind will veer about 30 degrees at ground level over land, so a quartering crosswind at best should be anticipated.