Which of the Following Chances Has the Biggest Expected Return

Multiple Choice

Which of the following chances has the biggest expected return?

A) a 50% chance of winning $1,600 and a 50% chance of winning $0
B) a 100% chance of getting $800
C) a 50% chance of winning $1,600, 25% chance of winning $3,200 and a 25% chance of losing $3,200
D) All of the above have the same expected return.