Voted for

• I will use either paper or plastic.

Probably. Or at least in the near future.
Nowadays I am using both paper and plastic bags.
But I more like the paper, because the paper is environment friendly.
Maybe I will (or at least I would) switch to paper (and other reusable) bags, but if they (the sellers at the stores) give me plastic bags, then I will not refuse it.
Leaving the plastic bags at the stores do not make any difference.