Convexity of indifference curves imply that consumers are willing to

Select one:

a.give up more "y" to get an extra "x" the less "x" they have.

b.give up more "y" to get an extra "x" the more "x" they have.

c.acquire more "x" only if they do not have to give up any "y".

d.settle for less of both "x" and "y".