Michelle melted a compound in the lab and performed the same procedure five times. The chart below shows the time it took for the compound to melt during the five trials.

Trial Time (min:sec)
1 3:14
2 3:10
3 4:05
4 3:12
5 3:09

After reviewing her data, she realized that trial 3 was vastly different from the other four trial times. Which of the following reasons could explain the radical difference in melting time for trial 3?

A larger quantity of compound was used in trial 3.
The compound started at a lower temperature in trial 3.
The burner was not directly under the compound during trial 3.
all of these