In each of the questions below, a grammatically coherent sentence is split into four distinct fragments marked as (A), (B), (C), and (D). You are required to sequence these fragments in the correct order to form a logical and grammatically sound sentence. If the sentence is already in the correct sequence, select (E), 'No rearrangement required', as your choice.

basic shelter was (A) / required, like Sweden and Norway (B) / Dry leaves were the primary material gathered (C) / in areas where just (D)

To sequence the given sentence fragments into a grammatically sound and logically coherent sentence, let us analyze each fragment and how they connect with one another:

(A) basic shelter was
(B) required, like Sweden and Norway
(C) Dry leaves were the primary material gathered
(D) in areas where just

Step-by-step arrangement:

1. Identify the main subject and independent clause:
Fragment (C) "Dry leaves were the primary material gathered" forms a complete main clause stating what was gathered.

2. Connect to the prepositional phrase specifying location/condition:
Fragment (D) "in areas where just" naturally follows fragment (C) to specify where these dry leaves were gathered. Combining them gives: "Dry leaves were the primary material gathered in areas where just..."

3. Complete the conditional clause:
Fragment (A) "basic shelter was" completes the thought introduced by "where just". Joining (D) to (A) yields: "...in areas where just basic shelter was..."

4. Attach the concluding requirement and example:
Fragment (B) "required, like Sweden and Norway" finishes the sentence by stating what was needed ("was required") and providing geographical examples. Joining (A) to (B) yields: "...basic shelter was required, like Sweden and Norway."

Putting it all together, the correct sequence is (C) - (D) - (A) - (B):

"Dry leaves were the primary material gathered in areas where just basic shelter was required, like Sweden and Norway."

Thus, the correct sequence of fragments is CDAB.