Which type of punctuation signals the reader that words from a direct quotation have been changed by the writer?

parentheses
brackets
ellipses
quotation marks

The correct answer is BRACKETS.

When a word from a direct quotation has been changed by the writer, it is shown by the use of brackets or square brackets, which are always used in pairs.

For example, the original sentence to quote could be "we danced and shared a beautiful moment". To clarify the context you could write:

"We danced [in the streets under the rain] and shared a beautiful moment".

One important thing to have into account is that this changes should not change quotes original meaning.

answer; /// i believe the correct answer is (b) disposition