A letter about the meeting?

[rich7]

Test No. errors/inter-3 "Sally and her Letter", question 1

Sally sent out several letters to members about the proposed meeting but so far no-one has taken the trouble to answer her invitation.

(a) sent out
(b) to
(c) about
(d) answer

Test No. errors/inter-3 "Sally and her Letter", answer 1

Sally sent out several letters to members about the proposed meeting but so far no-one has taken the trouble to reply to her invitation.

Correct entry: reply to
The error was: (d) answer

You have not found the error.
Sally sent out several letters to members for the proposed meeting but so far no-one has taken the trouble to answer her invitation.
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what's the difference here?

[Torsten]

Well,

A letter or a message is about something and for somebody.

For example:

This is a message for Richard. Do you know what it is about? There is a letter on my desk. Is it for me?
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[rich7]

point taken, but can I anwer to an invitation?
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I should have been born in the USA.
I've got this thing about America.

[Christina328]

[Christina328]

[Alan]

Hi Christina328,

We answer a question but we reply to a written invitation.

Alan
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English as a Second Language
You can read my ESL story A New Season