Tobie is estimating the sum of the expression -50 + 51. Which reasoning would lead Tobie to the correct answer?
A. If 50 is added to -50, the result is -100, plus -1 equals -101.
B. If 50 is added to -50, the result is zero, plus -1 equals -1.
C. If 50 is added to -50, the result is zero, plus 1 equals 1.
D. If 50 is added to -50, the result is 100, plus 1 equals 101.