In each question four words are highlighted, which may or may not be correctly placed. Choose the correct replacement in between the highlighted words that can give appropriate meaning to the sentence.

Taking great care (A) while believed(B) the block of ice, the artist chiseling (C) that this would be his greatest sculpture (D) yet.

The correct answer is Only (B) -(C).

Let us analyze the sentence and check the contextual and grammatical role of each highlighted word:

1. care (A): Noun. "Taking great care" is a grammatically correct and idiomatic phrase meaning paying close attention or being cautious.

2. believed (B): Verb (past tense). In the given sentence, "while believed the block of ice" is grammatically incorrect because "while" here needs a participle/action word (gerund) describing what the artist was actively doing to the ice block, such as "chiseling".

3. chiseling (C): Present participle / Gerund. Place (C) following "while" to form "while chiseling the block of ice", which correctly describes the action being performed on the ice block.

4. sculpture (D): Noun. "greatest sculpture" is grammatically correct as it functions as the object of his creation.

Now, let us place believed (B) where chiseling (C) originally was: "...the artist believed (C) that this would be his greatest sculpture yet." This forms a perfectly coherent sentence in the past tense.

Swapping word (B) with word (C) yields the correct and meaningful sentence:

"Taking great care (A) while chiseling (B) the block of ice, the artist believed (C) that this would be his greatest sculpture (D) yet."

Therefore, the correct replacement required is Only (B) -(C).