The correct answer is 'with.' Key Points - Let us look at the usage of the given options: - We can use 'with' when you're talking about people, or things being together. - Example: I was with Jane yesterday when the accident happened. - We use by meaning 'not later than' to refer to arrangements and deadlines. - Example: The postman is always here by 11am . - We use at to talk about points in time, ages and some periods of time. - Example: I was up at 6 am this morning. - We use for to talk about a purpose or a reason for something. - Example: I want to visit him only for you. - Correct sentence: A woman who always connives with her children to hide their faults, is their worst enemy.