The correct answer is “for”.
The word “for” is used to indicate the purpose or reason for something. In this case, the speaker is offering to help, and the word “for” indicates that the help is being offered for the benefit of the listener.
The other options are not as appropriate in this context. The word “in” could be used to indicate that the speaker is offering to help with a specific task, but it does not convey the same sense of purpose or intention as the word “for”. The word “about” could be used to indicate that the speaker is offering to talk about something, but it does not convey the same sense of willingness to help as the word “for”. The word “of” could be used to indicate that the speaker is offering to provide something, but it does not convey the same sense of personal involvement as the word “for”.
In conclusion, the correct answer is “for” because it is the most appropriate word to indicate the purpose or reason for the speaker’s offer to help.