Notice that the segment from -1 to 0 is divided in four equal parts, as well as the segment from 0 to 1.
Therefore, each small vertical line represents a quarter.
Recall the following equivalences:

Since the point A is one mark to the left of the number 0, it represents -1/4.
Since the point D is three marks to the left of the number 0, it represents -3/4.
The letter B is two marks to the right of the 0, so, it represents 2/4, which is equal to 1/2.
Finally, the letter C is placed three marks to the right of the number 0, therefore, it represents 3/4.
Notice that some options are written using fractions while others are written using