Correct option is A
Solution:
The number 1 is a factor of all numbers because any number divided by 1 will always give the number itself.
For example:
5 ÷ 1 = 5
10 ÷ 1 = 10
-3 ÷ 1 = -3
10 ÷ 1 = 10
-3 ÷ 1 = -3
Thus, 1 is a factor of every integer, making 1 the correct answer.
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