Rika's Opportunity Cost of Producing 100 T-Shirts Is 50 Jackets

Rika's opportunity cost of producing 100 t-shirts is 50 jackets. Jeff's opportunity cost of producing 75 t-shirts is 25 jackets. Who should specialise in jackets?

A) Rika
B) Jeff
C) Neither
D) Both
E) More information is needed about their production possibilities frontiers to determine who should specialise in jackets.