The correct answer is A. Blunder.
A blunder is a serious mistake or error. It is often used to describe a mistake that has serious consequences. For example, a doctor might make a blunder if they operate on the wrong patient.
A misadventure is an unfortunate event that happens by chance. It is often used to describe an event that is not serious, but is still unpleasant. For example, a
person might have a misadventure if they get lost while hiking.Ambiguity is a lack of clarity or precision. It is often used to describe a situation where the meaning of something is unclear. For example, a sentence might be ambiguous if it can be interpreted in two different ways.
Misgiving is a feeling of doubt or suspicion. It is often used to describe a feeling that something is not right. For example, a person might have misgivings about a new job if they are not sure if they are qualified for it.
In the context of the question, the word “error” is most closely synonymous with the word “blunder.” This is because an error is a mistake or a wrong action, and a blunder is a serious mistake or error. The other options, misadventure, ambiguity, and misgiving, are not as closely related to the word “error.”