Rearrange the following sentences in correct order to make a logical passage. 1. This helps prevent nutrient depletion and soil erosion. 2. Crop rotation is a sustainable agricultural practice. 3. It involves planting different crops sequentially on the same land. 4. It also reduces the need for synthetic fertilizers.

Correct — A. Sentence 2 names the topic, crop rotation, so it opens.

It involves (3) defines the practice that 2 named.
This helps (1) gives its first benefit: preventing nutrient depletion and soil erosion.
It also (4) adds a second benefit, so it must follow the first.

2-3-1-4 → option (a).

Why the others are wrong

• (b)
  1-2-3-4 — It opens with This helps, and This has nothing to refer to. The topic, crop rotation, is not named until the second sentence.
• (c)
  2-4-1-3 — It also comes straight after the topic, before any first benefit, and the definition (3) is left to the end, after the benefits of a practice not yet explained.
• (d)
  3-4-2-1 — It opens with It involves, but It has no antecedent. The name crop rotation arrives only in the third sentence of this order.

This jumble has a clear shape: topic → definition → first benefit → second benefit. The pointing words give the order away:

It needs a noun already named.
This needs an idea already stated.
Also needs an earlier item of the same kind.

Sentence 2 has no pointing word, so it opens.

Key facts

• Sentence 2 names the topic and has no pronoun pointing back.
• It involves (3) defines crop rotation: different crops planted sequentially on the same land.
• This helps (1) is the first benefit: preventing nutrient depletion and soil erosion.
• It also (4) is the second benefit: less need for synthetic fertilizers.

Common traps

• Putting It also directly after the topic sentence, before any first benefit has been stated
• Opening with It involves because it reads like a definition, although It has nothing to refer to

No directly related past PYQ was found.