Alejandro bought $3.50 worth of pencils and erasers at the school store. Pencils cost $0.50 apiece, and erasers cost $0.75 apiece. Which equation written in standard form represents the number of pencils, p, and the number of erasers, e, that Alejandro bought?
A. 0.75e = 3.50 - 0.50p
B. 0.50p + 0.75e = 3.50
C. 3e = 14 - 2p
D. 2p + 3e = 14
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