Identify the change in the line/ phrase which best suits a diary entry- 

Younger brother’s birthday party 

In a diary entry, the writer expresses his feelings, emotions, and thoughts in the same way that he would to a best friend. The language employed is informal and intimate, expressing the appropriate feeling at the time.

Option C is the right answer. The writer is content and joyful, as evidenced by the diary entry's statement.

Options A, B, and D are inappropriate because the assertions are far too formal for a diary entry and so do not follow the diary entry pattern.

An assertion is defined as a claim or declaration of something, frequently based on opinion rather than truth. A person who boldly speaks up in a meeting and makes a point in opposition to the presenter, although having strong evidence to back up his claim, is an example of someone making an assertion.