Final answer:
The sentence 'Thanks to these training sessions, I have become more confident' from paragraph 5 best illustrates the author's increased confidence.
Step-by-step explanation:
The sentence from paragraph 5 that best illustrates the author's feeling of increased confidence is: 'Thanks to these training sessions, I have become more confident.'
This sentence clearly states that the author's confidence has been boosted as a result of participating in the training sessions. By mentioning that she no longer hesitates and bows her head when speaking before a group of men, the author also implies that she has gained more self-assurance and assertiveness through her life experiences.