What is the appropriate correction for sentence 7?

The appropriate correction for sentence 7 is to use "and extends." This choice correctly connects two ideas or clauses in a compound structure. The conjunction "and" is used to link two related thoughts, creating a smooth transition between them. The verb "extends" should follow directly after "and" without any additional punctuation or unnecessary capitalization. This structure is ideal for maintaining the flow of the sentence while clearly indicating that the action of extending is closely related to the previous action or idea expressed in the sentence.

Other options either leave the sentence unchanged, which may fail to provide the necessary clarity or connection between ideas, or incorrectly add punctuation, which could disrupt the natural rhythm of the sentence. The use of a semicolon or an uppercase "And" would suggest a different grammatical relationship that may not be appropriate in this context. Hence, "and extends" is the most suitable correction, as it preserves the intended meaning while enhancing the coherence of the sentence.