Answer:
The expected of both offers are:
Offer A's expected price = $4 million
Offer B's expected price = ($1 million x 0.6) + ($9 million x 0.4) = $4.2 million
Jamal's utility function U = W¹/² or U = √W
Offer A's expected utility = √$4,000,000 = 2,000 utils
Offer B's expected utility = √$4,200,000 = 2,049 utils
Both the difference in expected value and utility is not that large, but the difference in risk is great, so if I was Jamal I would choose option A.