An Investor Enters into a Long Position in 10,000 Futures

An investor enters into a long position in 10,000 futures contracts of oil with a $50,000 initial margin and has a maintenance margin that is 75 percent of this amount.The futures price associated with this contract is $100.Assuming the price of the underlying asset decreases to $98,what is the margin call?

A) $50,000
B) $37,500
C) $7,500
D) No margin required