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) 2, 1, 3, 4 is the correct order of the given sentences.
Explanation (why this order is correct):
• 2 is the best opening because it introduces the topic and establishes importance: research is foundational.
• 1 logically follows because “It” clearly refers to research and defines what research is (systematic investigation).
• 3 comes next because “This” refers to the process of research and classifies it into theoretical vs applied.
• 4 is the natural conclusion, describing what happens after investigation—documentation and peer review for credibility.