ishfaque

i guess it has to do with the supply curve - i remember the book talking about how frasier ( K. Grammer) earned millions for 1/2 hr of work. the difference between this wage and what he would earn in his next best job (opportunity cost) is economic rent.
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so in our choices A) is saying that the one with the higher MRP WILL earn a higher economic rent, this is possible but not necessarily if the factor of input is easy to come by (supply.)

sheesh.....here you go:

Statement 2 is incorrect. The extent to which a factor of production earns economic rent depends on the shape of its supply curve. An input with a high MRP might earn very little economic rent if the supply of the input is highly elastic. An input with a relatively lower MRP can earn significant economic rent if its supply is highly inelastic.