(A) one of the most ancient

(B) acupuncture is regarded as

(C) treatment practiced worldwide

(D) forms of alternative

In the question below, a sentence is divided into four parts namely (A), (B), (C), and (D). Rearrange these four parts to make a contextually and grammatically meaningful sentence. If no rearrangement is needed, select 'No rearrangement required' as your answer.

The correct option is BADC.

To form a grammatically correct and contextually meaningful sentence, let us analyze the given sentence fragments step-by-step:
1. Part (B) acupuncture is regarded as introduces the primary subject ("acupuncture") along with the introductory verb phrase, establishing the beginning of the sentence.
2. Part (A) one of the most ancient naturally follows "regarded as" to specify what acupuncture is considered to be.
3. Part (D) forms of alternative connects smoothly with part (A), completing the phrase "one of the most ancient forms of alternative".
4. Part (C) treatment practiced worldwide completes the noun phrase "alternative treatment" and provides the final descriptive clause about its global practice.

Combining the parts in the sequence B-A-D-C forms the coherent sentence:
"Acupuncture is regarded as one of the most ancient forms of alternative treatment practiced worldwide."

Therefore, the correct arrangement is BADC.