Consider the following financial positions of three investors:

Investor A holds one European call option with $40 exercise price on a portfolio that consists of one share of IBM and one share of Microsoft

Investor B holds two European call options: one gives the right to buy a share of IBM for $20 and the other gives the right to buy a share of Microsoft for $20

Investorc holds two European call options: one gives the right to buy a share of IBM for $30 and the other gives the right to buy a share of Microsoft for $10

Which of the three investors has a more valuable position? Less valuable position? If you need more information to take a position state so. Assume all options expire in one year.