First of all, the core of the baseball is made of cork. The cork is cushioned by two layers of rubber. The cushioned cork center is then wrapped with yarn. This yarn makes up most of the baseball. In fact, if you stretched out the yarn into a straight line, it would be longer than three football fields! Once the yarn is wrapped around the core, a white leather cover is applied with rubber cement and sewn together. Each ball has 216 stitches of waxed red thread, of which 88 inches, or more than seven feet, are used.


Which of the following sentences would best conclude this paragraph?

A.
Nobody has ever hit the cover off the ball.
B.
Before 1910, the core of the ball was made of rubber instead of cork.
C.
All of those materials make the ball rock-hard and very durable.
D.
It's hard to believe that it could be so small!