Directions: In the sentence given below, four words marked as (A), (B), (C), and (D) may not be in their proper positions. Choose the pair of words that must be interchanged to make the sentence grammatically correct and contextually meaningful.

Active listening (A) and thorough solve (B) enable managers to analysis (C) critical problems and make sound decisions (D).

The correct option is B-C.

Step-by-step Explanation:

1. Analyze the given sentence:
"Active listening (A) and thorough solve (B) enable managers to analysis (C) critical problems and make sound decisions (D)."

2. Identify grammatical and contextual inconsistencies:
- At position (B), the word "solve" is a verb. However, it follows the adjective "thorough", which requires a noun. Placing the noun "analysis" here creates the meaningful phrase "thorough analysis".
- At position (C), the word "analysis" is a noun following the infinitive marker "to". An infinitive construction requires a base verb (to + verb). Replacing "analysis" with the verb "solve" gives "to solve critical problems", which is grammatically correct.

3. Sentence after swapping words at (B) and (C):
"Active listening (A) and thorough analysis (B) enable managers to solve (C) critical problems and make sound decisions (D)."

Therefore, interchanging the pair of words B-C restores correct grammar and meaningful context to the sentence.