A Law Firm Will Be Paid $500 to Send One

A law firm will be paid $500 to send one of its lawyers to a client to take a routine deposition. The firm can send a 2nd year lawyer whose usual billing rate is $150 per hour and who is currently working on a lucrative tax deal, or it can send a 4th year associate (billing rate $200 per hour) who is currently overseeing the selection and hiring of law students as summer associates. Based on this information, the firm should send:

A) the 2^nd year lawyer because his billable rate is lower.
B) the 4^th year lawyer because her billable rate is higher.
C) the 2^nd year lawyer because he is currently more productive.
D) either one since the firm receives the same $500 fee.
E) the 4^th year lawyer because her current work is less valuable to the firm.