A.)He thinks she shouldn't worry about the performance.
Explanation:
Hurstwood thinks that Carrie should not worry herself about the performance. Before her performance, Carrie was overcome by fear. Hurstwood sensing Carrie's fear went to her, to encourage her not to be scared as the audience would not be very critical of her performance.
He reminded her that there might be a possibility of missing some of her lines but that she should not be deterred by that.
