I love heat but my body can't handle it. I sweat very easily and I hate it.
In the cold I'm at home and I guess that kind of comes with the territory when living in Finland. We can handle cold and we are absolutely crazy. There can be -20 degrees celsius and there's still guys with just jeans and hoodies and girls in skirts.
I'm definitely more comfortable in the cold, so I chose B. But I was confused by your question, because you said you were hot-natured, and then went on to say that above 75 degrees is too much for you. If you were hot-natured wouldn't that mean you were comfortable in the heat?
I'm okay with either but it's easier to dress in colder weather... well not the putting clothes on in the cold part but the style, at least you're keeping warm by dressing yourself whereas in summer if you put anything on all you want to do is take it off.