Sophie shared a secret with her brother, and the correct answer is option 'D' - she met Danny Casy, a famous footballer. Let's discuss this answer in detail.

Danny Casy as a famous footballer
Danny Casy is a well-known footballer in the sports industry. He has achieved great success and has a significant fan following. Sophie sharing this secret with her brother indicates that she had the opportunity to meet this famous personality.

Reasons for Sophie's excitement
Meeting a famous footballer like Danny Casy would be an exciting and memorable experience for Sophie. It is quite common for individuals, especially sports enthusiasts, to be thrilled about meeting their favorite athletes. Sophie's excitement could be attributed to various reasons:

1. Admiration for his skills: Sophie might be a fan of Danny Casy's football skills and might have followed his career closely. Meeting someone she admires and looks up to can be a dream come true for her.

2. Inspiring figure: As a prominent footballer, Danny Casy could serve as an inspiration to Sophie. His achievements and dedication to the sport might motivate her to pursue her own dreams and goals.

3. Personal connection: Sophie might have a personal connection or a particular reason to be excited about meeting Danny Casy. It could be related to her own involvement in the football or sports industry, or she may have a special appreciation for his contributions off the field.

4. Exclusive opportunity: Meeting a famous personality like Danny Casy would likely be an exclusive opportunity that not many people get. Sophie's excitement could stem from the rarity of the experience and the bragging rights that come with it.

Sibling bond and trust
The fact that Sophie shared this secret with her brother suggests a strong bond of trust between them. Sophie likely confided in her brother because she wanted to share her excitement and have someone to discuss her experience with. Siblings often share personal and exciting moments with each other, knowing that they can trust and rely on each other for support.

In conclusion, Sophie's secret that she shared with her brother was about meeting Danny Casy, a famous footballer. This secret likely brought her immense excitement due to her admiration for his skills, his inspirational figure, personal connection, and the exclusivity of the opportunity. The fact that she confided in her brother highlights their strong sibling bond and trust in each other.