Below are given two sets-research methods (Set-I) and data collection tools (Set-II). Match the two sets and indicate your answer.

List-I (Research Methods)	List-II (Data Collection Tools)
a. Experimental method	1. Using primary and secondary sources
b. Ex post facto method	2. Questionnaire
c. Descriptive survey method	3. Standardised tests
d. Historical method	4. Typical characteristic tests

A. a-2, b-1, c-3, d-4

B. a-2, b-3, c-1, d-4

C. a-3, b-4, c-2, d-1

D. a-2, b-4, c-3, d-1

Answer: Option B