Select the most appropriate option to fill in the blank.

He is a ______ in shining armour.

knight

The correct option to fill in the blank is knight.

The word "knight" refers to a man who has been granted a high military rank by a monarch. It is the most appropriate word to use in this context, as it conveys the meaning of the person being portrayed as a brave and noble figure.

The other options are not as appropriate.

• Knit means to make something by looping yarn in and out of itself. This is not the right word to use, as it does not make sense to say that the person is a knit in shining armor.
• Nite is a misspelling of the word "night." This is not the right word to use, as it is not a grammatically correct word.
• Night refers to the period of darkness between sunset and sunrise. This is not the right word to use, as it does not convey the same meaning as "knight."