An investor has bought 7 contracts of oil at the price of 38$/barrel. Each contract concerns 1200 barrels. If the price at maturity rises to $42/barrel calculate the profit / loss of the investor and choose one of the following:

a. 8400 X 4 = profit $33.600

b. 8400 X (-4) = loss $ 33600

c. 1200 X 4 = profit $4800

d. 7000 X 4 = profit $ 28000