Rearrange the following sentences to form a coherent paragraph:
1. It is a process that involves the systematic and objective investigation of a subject to discover new facts or to confirm existing ones.
2. Research is a foundational pillar of academic and scientific progress.
3. This can be either theoretical, aiming to expand knowledge, or applied, seeking to solve a practical problem.
4. The findings of this investigation are then documented and peer-reviewed to ensure validity and credibility.

Correct option is A

Option (a) is the correct order of the given sentences.
· 2 → Topic sentence: Introduces research as the central theme and its importance.
· 1 → Definition: Explains what research is in a formal, process-oriented manner.
· 3 → Classification: Differentiates theoretical vs. applied research, extending the definition.
· 4 → Outcome/validation: Concludes with documentation and peer review, the standard academic end-stage.
· The coherence flows general → specific → types → validation, which is the conventional expository order for academic topics.