Final answer:
Correct capitalization of days of the week is important in sentences.
Explanation:
The correct sentence is: "He said, 'Let's go to the park on Monday."
In this sentence, the days of the week are capitalized correctly - 'Monday' is capitalized. Remember to capitalize days of the week, months of the year, and holidays in your sentences.
Additionally, remember to capitalize the first word of a sentence and proper nouns, such as names of specific people, places, organizations, countries, nationalities, languages, and religions.
Learn more about Capitalization in English sentences here:
https://brainly.com/question/41192944
