Getting 10-1, this board is a crying call with Ace-Big or better.

Not sure how this could go differently (call the flop and donk the turn doesn't make anything different.

Possibly call the flop and try for a CR the turn, but I'm not sure this does anything but spew chips when you're behind.

Maybe check call the turn but that seems weak for top pair, even on a straight board (you really don't want to give free card to a guy who raised an open ender on the flop).

No way this is a fold on the river though, especially against an unknown. AK A3 A6 88 63 T3 are all hands the BB could be playing like this and you have beat.