(A) warmth was needed,

(B) such as China and Japan

(C) wood was the earliest fuel used in

(D) places where only moderate

In the question below, a grammatically correct and meaningful sentence is given which 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 such rearrangement is needed, mark 'No rearrangement required' as the answer choice.

The correct rearrangement is CDAB.

Let us analyze the given parts to form a grammatically correct and coherent sentence:
1. Part (C) wood was the earliest fuel used in serves as the starting clause, introducing the main subject ("wood") and the action.
2. The preposition "in" at the end of part (C) requires a location or noun phrase to follow it. Part (D) places where only moderate fits perfectly, specifying the locations ("in places where...").
3. The phrase "where only moderate" in part (D) ends with an adjective that requires a noun. Part (A) warmth was needed, provides that noun ("warmth") and completes the relative clause ("where only moderate warmth was needed").
4. Finally, part (B) such as China and Japan provides examples of the "places" described, following the comma after "needed".

Combining these parts in the order of C → D → A → B forms the complete, logical, and grammatically correct sentence:
"Wood was the earliest fuel used in places where only moderate warmth was needed, such as China and Japan."