A sociologist studied the learning capacity of toddlers by joining a preschool for six months. During this period, he observed the activities of toddlers and asked questions related to their development to their parents and teachers. In this scenario, the sociologist most likely conducted .

Field research.

Explanation:

Since the sociologist studied the learning capacity of toddlers by joining a preschool for six months, he has likely conducted a field research or a field study. Field research is the collection of raw data outside a laboratory or a library. It is a qualitative method of data collection that aims to observe, interact and understand people while they are in a natural environment. It focuses on capturing live experiences.

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