In each of the following questions, four words are highlighted in bold, which may or may not be in their correct positions. Select the combination of words that need to be interchanged to make the sentence grammatically correct and contextually meaningful.

Tomorrow evening, Clara will join the group (A) of veteran violin players to be celebrated (B) as a soloist (C) of the conductor’s special ensemble (D)

The correct option is Only (A) - (D).

Explanation:
Let us analyze the given sentence and the highlighted words:

Original sentence:
"Tomorrow evening, Clara will join the group (A) of veteran violin players to be celebrated (B) as a soloist (C) of the conductor’s special ensemble (D)"

In musical terminology, an ensemble refers to a unit or group of musicians performing together. Therefore, pairing "ensemble" with "veteran violin players" forms a contextually precise phrase: "ensemble of veteran violin players". Conversely, placing "group" to refer to the conductor's group completes the context smoothly.

Interchanging word (A) group and word (D) ensemble results in:
"Tomorrow evening, Clara will join the ensemble of veteran violin players to be celebrated as a soloist of the conductor’s special group."

Hence, swapping (A) and (D) makes the sentence both grammatically correct and contextually meaningful.