Which of the following is an example of a declarative sentence?

A declarative sentence makes a statement, provides information, or expresses an opinion. It typically follows a subject-verb-object structure and ends with a period. The option "It is raining today" clearly states a fact about the weather, fulfilling the definition of a declarative sentence.

In contrast, the other choices serve different functions. The first option is an interrogative sentence that asks a question, the second is an imperative sentence that gives a command or warning, and the final choice is also an imperative sentence instructing someone to perform an action. Each of these alternatives does not convey information or opinions in the same straightforward manner as a declarative sentence does, reinforcing why the selected sentence stands out as the correct example.