Answer:
(C)
Interview/questionnaire/schedule
Step-by-step explanation:
In sociological research, to gather Quantitative information, is to conduct Quantitative research method, which is basically involved description of phenomena by gathering and collecting numerical data such as length, size, amount, price, and even duration, that are systematically analysed using mathematically based methods.
In quantitative research, the numerical data is often collected using structured research instrument such questionnaire, interviews, or schedule to be filled.
Hence, In sociological research, the quantitative information is sought through the method of Interview/questionnaire/schedule.