Which number line correctly shows the numbers that are less than a number X?

In a number line, the numbers increase from left to right. Therefore, the numbers that lie to the right of a number are greater than that number, whereas the numbers that lie to the left of a number are lesser than that number.

Thus, the numbers that are less than a number X lie to its left and can be shown on a number line as

Thus, the number line shown in alternative C correctly shows the numbers that are less than a number X.