Questions :

Options :
- 2, 1, 3, 4
- 1, 2, 4, 3
- 4, 3, 2, 1
- 3, 4, 1, 2
correct answer : a)
Explanation :
Sentence 2 introduces the topic (Research). Sentence 1 defines the process. Sentence 3 explains the types of research. Sentence 4 concludes with the outcome and verification of the investigation. Hence, the correct answer is option (a) 2, 1, 3, 4.