I need some help with this stats question

A psychologist is interested in knowing whether adults who were bullied as children differ from the general population in terms of their empathy for others. On a questionnaire designed to measure empathy, the mean score for the general population is 30.6. Random sampling of 25 scores obtained from individuals who were bullied yielded a sample mean of 39.5 and a sample standard deviation of 6.6.

Suppose you want to calculate the 99% confidence interval.

What is the new critical value you will use for this calculation?

1.645

2.064

2.756

2.797

6.74