The Amaco Middle School bookstore sells pencils costing a whole number of cents. Some seventh graders each bought a pencil, paying a total of $1.43$. Some of the 30 sixth graders each bought a pencil, and they paid a total of \$ 1.95. How many more sixth graders than seventh graders bought a pencil?
Answer Choices
A. 1
B. 2
C. 3
D. 4
E. 5