Question:

The study on import of natural gas from Iran through a pipeline would be completed shortly.

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Think of the standard term for a study done before a big project, like a pipeline, is approved.
Updated On: Jul 13, 2026
  • Natural
  • Calculated
  • Economic
  • Feasibility
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The Correct Option is D

Solution and Explanation

The sentence talks about a study being done before a project (importing gas through a pipeline) goes ahead. This is a classic setting for one specific type of study used before big infrastructure projects.

  1. Natural: This is an adjective describing something occurring in nature or being usual, and does not describe a type of study at all.
  2. Calculated: This means carefully planned or estimated, but it is not the standard term used for pre-project studies; it also usually describes an action or risk, not a "study" as a noun phrase.
  3. Economic: This could describe a study about cost, but on its own it is too narrow. A study on whether to build a gas pipeline covers more than economics alone: technical, safety and political factors as well.
  4. Feasibility: A "feasibility study" is the standard term for a study conducted to check whether a project is practically possible and worth doing before committing resources to it.

Since the sentence is about assessing a pipeline project before it proceeds, the fixed phrase "feasibility study" is the exact fit.

Let's summarize:

  • "Feasibility study" is a well known collocation for a pre-project assessment.
  • "Economic" is too narrow, and "Natural" and "Calculated" do not describe a type of study at all.

The sentence becomes: "The feasibility study on import of natural gas from Iran through a pipeline would be completed shortly," making option (4) correct.

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