Answer:

The correct answer is option 'A' - comma.

Explanation:

A comma is used to indicate a pause within a sentence. It is a punctuation mark that helps to separate ideas and improve the clarity and readability of a sentence. Commas are used in various ways, including to separate items in a list, to separate clauses in a compound sentence, and to indicate a pause or a brief interruption within a sentence.

Usage of a comma:

1. Separating items in a list: Commas are used to separate items in a list. For example: "I need to buy apples, bananas, and oranges." Here, the comma is used to separate the items in the list.

2. Separating clauses in a compound sentence: When two or more independent clauses are joined by a coordinating conjunction (such as "and," "but," "or," etc.), a comma is used before the conjunction. For example: "I went to the store, and I bought some groceries." Here, the comma separates the two independent clauses.

3. Indicating a pause or interruption: Commas are used to indicate a pause or a brief interruption within a sentence. This can be used to provide additional information or to separate elements within the sentence. For example: "She is a talented singer, with a beautiful voice." In this sentence, the comma is used to separate the main subject ("She is a talented singer") from the additional information ("with a beautiful voice").

4. Setting off introductory or parenthetical phrases: Commas are used to set off introductory or parenthetical phrases. These are phrases that provide additional information but are not essential to the main meaning of the sentence. For example: "However, I decided to go anyway." Here, the comma sets off the introductory word "however."

It is important to use commas correctly to ensure clarity and avoid confusion in writing. Commas help to indicate pauses and separate different parts of a sentence, improving its overall structure and readability.