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Jimhas identical drinking glasses each in the shape of a right circular cylinder with internal diameter of $3$ inches. He pours milk from a gallon jug into each glass until it is full. If the height of milk in each glass is about $6$ inches, what is the largest number of fulld milk glasses that he can pour from one gallon of milk? (Note: There are $231$ cubic inchesin $1$ gallon.)$\newline$A) $2$$\newline$B) $4$$\newline$C) $5$$\newline$D) $6$