A study was done on the effects of sleeping on test scores. 15 people were asked to reduce their sleep amount by different amounts and were given a series of test the next day. The results are shown above in the scatter plot. According to the line of best fit, what would be the best estimate for the test score of someone who slept only 1 hour?

A 40
B 25
C 30
D 55

Based on the scatter plot and line of best fit, the best estimate for the test score of someone who slept only 1 hour would be approximately 30.

Therefore, the correct answer is C) 30.