< b="" />Explanation:< />

The correct answer is option 'D' - Blunder.

< b="" />Definition:< />
A blunder refers to a careless or foolish mistake or error. It is an act or decision that is made without proper thought or consideration. Blunders often result in negative consequences or outcomes.

< b="" />Explanation:< />
Here is an explanation of the other options and why they are not the correct answer:

a) Misadventure: Misadventure refers to an unfortunate incident or event that occurs by chance or accident. It is often used to describe a mishap or misfortune that happens during an adventure or journey. However, misadventure does not specifically imply a mistake or error.

b) Misgiving: Misgiving refers to a feeling of doubt, distrust, or apprehension about something. It is a sense of unease or uncertainty about a situation or decision. Misgiving does not imply a mistake or error in the same way that blunder does.

c) Ambiguity: Ambiguity refers to a lack of clarity or uncertainty in meaning. It is when something is open to multiple interpretations or has more than one possible meaning. While ambiguity can lead to confusion or misunderstanding, it does not necessarily imply a mistake or error.

In contrast, a blunder specifically refers to a mistake or error that is made due to carelessness or lack of proper thought. It implies a sense of foolishness or negligence in the decision or action taken. Unlike misadventure, misgiving, or ambiguity, a blunder is a clear indication of a mistake or error.

Therefore, the correct answer to the question is option 'D' - Blunder.