The correct answer is: B. about
Idle talks are unnecessary and unproductive conversations. They are often used to fill silence or to avoid more serious topics. When you are writing, you should avoid including idle talks because they do not contribute to the main point of your writing.
Option A, “in,” is incorrect because idle talks are not included in a piece of writing. They are not part of the main point of the writing.
Option C, “over,” is incorrect because idle talks are not discussed over a particular topic. They are often random and do not have a specific focus.
Option D, “on,” is incorrect because idle talks are not written on a particular topic. They are often general and do not have a specific focus.
In conclusion, the correct answer is “B. about” because idle talks are unnecessary and unproductive conversations that are often used to fill silence or to avoid more serious topics. When you are writing, you should avoid including idle talks because they do not contribute to the main point of your writing.