AMC8 1992 Problem 1

Past Contests AMC8 AMC 8 - 1992
1

\dfrac{10-9+8-7+6-5+4-3+2-1}{1-2+3-4+5-6+7-8+9}=

Answer Choices
A. -1
B. 1
C. 5
D. 9
E. 10