Sophie liking her brother Geoff more than anyone else can be attributed to several reasons, all of which are mentioned in the given options. Let's explore each of these reasons in detail:

Silent Nature (Option a):
One of the reasons why Sophie likes her brother Geoff more than anyone else is because he keeps silent. Silence can be comforting and reassuring, especially when someone needs space or time to think. Geoff's ability to remain quiet allows Sophie to have moments of solitude or introspection without feeling pressured to engage in conversation. This can foster a sense of ease and understanding between them, enhancing their relationship.

Secret Keeper (Option b):
Another reason for Sophie's preference towards Geoff is that he keeps her secret. Having someone who can be trusted with personal information is crucial in maintaining a strong bond. Sophie might confide in Geoff about her thoughts, feelings, or experiences, knowing that he will not betray her trust. This level of confidentiality creates a safe space for Sophie to express herself freely, strengthening their connection and making Geoff a reliable confidant.

Ability to Confide (Option c):
Geoff's ability to listen and offer support makes Sophie feel comfortable confiding in him. When someone can openly share their thoughts, fears, or dreams without judgment, it establishes a deep sense of intimacy and emotional closeness. Sophie may find solace in Geoff's understanding and empathy, allowing her to be vulnerable and seek advice or guidance whenever needed.

Combination of Factors (Option d):
All the mentioned reasons - Geoff's silence, his ability to keep Sophie's secrets, and her ability to confide in him - contribute to Sophie's preference for her brother. It is the combination of these factors that creates a unique and special bond between them. Geoff's qualities make him an indispensable figure in Sophie's life, someone she can rely on and trust unconditionally.

In conclusion, Sophie's preference for her brother Geoff over anyone else is based on a combination of factors. His silent nature, ability to keep her secrets, and the comfort she finds in confiding in him all contribute to the strong bond they share. These qualities make Geoff an important and valued person in Sophie's life.