You can write the problem x < 7 on the number line as,

The correct answer is: Open circle going towards 0

Step 1 of 2:
Given that, x < 7.
According to the fact stated in the hint that x does not attain the value 7, we represent that in the number line by drawing an open circle around the point 7.
Step 2 of 2:
Then another fact is that x attains the values less than 7.
And we can show the values by highlighting the values less than 7, viz., left of the point 7 towards 0.
Hence, we can represent the inequality by the following figure,
.
Final Answer:
The correct option is-- a. Open circle going towards 0.