Which of the Following Chances Has the Biggest Expected Return

Multiple Choice

Which of the following chances has the biggest expected return?

A) a 100% chance of getting $1,500
B) a 60% chance of winning $3,000 and a 40% chance of winning $0
C) a 50% chance of winning $3,000, 20% chance of winning $6,000 and a 30% chance of losing $6,000
D) All of the above have the same expected return.