Answer:
Option B
Explanation:
Given the following question:

In order to find the answer to this question, we simply multiply by six on both sides.




Now in order to graph a solution on a number line we have to keep a few things in mind. For example, the greater than or equal to symbol, and the circle on the number line.
<
In this case we have a < symbol which means the number line will have a open circle. Since the line is < than the variable the line would go into the opposite direction of the < symbol, since it's less than 72.
Which means your answer is option B.
Hope this helps.