Bank a Is Able to Raise Funds at Libor $y$ BpsWhat Range of Basis Points

Bank A is able to raise funds at Libor + 10 bps.Bank B does so at Libor + 40 bps.Bank A buys a credit risky asset returning Libor + 100 bps,and then A and B enter into a total return swap (TRS) where A pays B the total return on the asset in return for Libor + $y$ bps.What range of basis points $y$ would be acceptable to both parties in the contract?

A) $y < 100$
B) $y > 10$
C) $40 < y < 60$
D) $10 < y < 40$