John invested $1,000 in a risky investment and Bill invested $1,000 in a less risky investment. One year later, Bill's investment is worth $1,030. Which of the following statements is most correct?

Select one:

a. The worth of John's investment cannot be determined with the information given.

b. If John's investment is worth more than $1,030, then Bill was irrational to invest in the less risky investment.

c. John's investment must be worth more than $1,030 because of the risk-return tradeoff, given that John's investment was more risky.

d. If John's investment is worth less than $1,030, then John was irrational to invest in the risky project.