Correct Answer: Blundering

Solution : The correct choice is the first option .

Erring means to make a mistake or do something wrong.

Blundering means making a serious mistake. Both of these words imply making a mistake, which makes them synonymous.

The meanings of the other options are as follows:

• Tidy means clean.
• Sloppy means excessively casual.
• Flawless means something that has no defects.