If a word is capitalized in the middle of a properly written sentence, chances are the word is?
a. a grammatical error.
b. a proper noun.
c. the start of a definition.
d. the most important word in the sentence.

B. A proper noun. This is because proper nouns are always capitalized no matter where they fall in a sentence. This includes if they are in the middle of a properly written sentence.

The word is a proper noun if it is capitalized in the middle of a property written sentence. So the best answer among the following question is letter B. Proper Noun. I hope you are satisfied with my answer and feel free to ask for more and feel free to ask for more