A is much less of a pain than C. At least in most cases the plug pinches into the outlet and stays in place.
I’ve used C while traveling for my charger and The weight of a few cords wants to drag that fucker out every time.
Also worth noting that A can come in the polarized (one plug slightly larger, fits one way) or non-polarised (doesn’t matter) variety.
Because water heating with heat pumps is currently garbage on the residential scale.
Also because we’re already stressing electric infrastructure with what we use now, and few plans to add capacity in any reasonable amount to deal with the massive increase in population, plus electric cars, AC during heat waves etc let alone home heating.
Gas is efficient for heating, and there’s plenty of other stuff we can and need to look at before we replace that.