A sentence is presented below with three words highlighted in bold. Select the option that provides the correct order of these words to ensure the sentence is grammatically sound and contextually appropriate.

The metropolitan authority's buses (A) to deploy (B) electric double-decker initiative (C) has begun to yield results.

The correct option is CBA.

Let's analyze the sentence structure and context to place the highlighted words in their correct positions:

1. Original sentence: "The metropolitan authority's buses (A) to deploy (B) electric double-decker initiative (C) has begun to yield results."

2. Identifying the correct subject: Possessive noun phrases such as "The metropolitan authority's..." require a noun. In this context, "initiative" fits best as the noun describing the authority's plan or action. Therefore, word (C) initiative should take position (A).

3. Identifying the verb action: The infinitive structure "to [verb]" follows "initiative". Here, (B) deploy is already a verb in its correct infinitive form ("to deploy"). Thus, word (B) deploy remains in position (B).

4. Identifying the object: The verb "deploy" acts upon the object being deployed, which is "electric double-decker buses". Therefore, word (A) buses should move to position (C).

Replacing the words according to the order C - B - A yields the grammatically correct and contextually appropriate sentence:
"The metropolitan authority's initiative (C) to deploy (B) electric double-decker buses (A) has begun to yield results."