On Monday, Martin had 5 2/3 gallons of gas in his car. On his way to work, he added 4 gallons to the tank. He
then drove to work and used 1 3/4 gallons. Three days later, he added 2 1/4 gallons of gas to his tank. He then
used 4 gallons of gas driving to his grandparent's house. How much gas remains in Martin's tank?
A 9 2/3 gallons
B 1/2 gallon
C. 6 1/6 gallons
D. 17 2/3 gallons