Correct Answer: magnificient

Solution : The correct choice is the second option.

The incorrectly spelled word is "magnificient", which contains an extra vowel "i". Magnificent is the correct spelling. It is used to describe something that is very beautiful, awe-inspiring, and needs to be admired.

The meanings of the other options are as follows:

• A millionaire is someone whose assets are worth over a million dollars.
• Mediocre is something that is of low quality.
• Miraculous is used to describe events that are inexplicable or seem to defy the laws of nature.