o no, I am running late and may not make the plane to chicago.
Choose the option that best corrects the sentence.
A NO CHANGE
B) O no, I am running late and may not make the plane to chicago.
C) o no, I am running late and may not make the plane to Chicago.
D) O no, I am running late and may not make the plane to Chicago.

Hint:
i) The first word, all nouns, all verbs (even short ones like is), all adjectives, and all proper nouns should all be capitalized.
ii) Proper nouns are always capitalized and allude to a specific person, place, or thing. Common nouns are only capitalized at the start of a sentence and allude to a general concept or entity.

Complete answer:
In the above sentence, there are mistakes in capitalization. The proper nouns such as names of places and people need to be capitalized and the first letter of the first word of a sentence is always capitalized.

Let us look at the given options and choose the correct answer:
A NO CHANGE: This option is incorrect because the above sentence requires corrections. Some letters in this sentence need to be capitalized.
B) O no, I am running late and may not make the plane to chicago.: This option is incorrect because although the first letter of the sentence has been capitalized yet the proper noun, Chicago, has not been capitalized. So this cannot be the answer.
C) o no, I am running late and may not make the plane to Chicago.: This option is incorrect because the first letter of the sentence is not capital. In English, the first letter of a sentence is always capitalized.
D) O no, I am running late and may not make the plane to Chicago.: This is the correct answer. The initial word of a sentence is always capitalized, as a general rule. All proper nouns in a sentence, such as people's, places', and things' names, are capitalized. As a result, Option D is the correct solution according to the guidelines.

Thus, the correct answer is option D) O no, I am running late and may not make the plane to Chicago.

Note: Some rules of capitalization are as follows:
- The first word of a sentence should be capitalised.
- Names and other proper nouns should be capitalised.
- After a colon, don't capitalise (Usually).
- The first word of a quote should be capitalised (Sometimes).
- Days, months, and holidays should all be capitalised, but seasons should not.
- In titles, capitalise the majority of the words.