She almost says that it doesn't matter. Neither of those things matter. This whole situation is a pointless farce, so pick something short so they can get it over with. For Steve's sake, she keeps her frustration to herself.

She gives his hand a squeeze in return.

"Envy. Wherever you're comfortable putting it. Somewhere people won't see it all the time." That seems the safest. And it's a blessedly short word. "I might not be a super soldier, but I heal pretty well. Just keep it clean."