Observation is the market research technique
a. that attempts to compare the responses of the same or similar people under different circumstances.
b. that uses a questionnaire that is either mailed to individuals or used as the basis of telephone or personal interviews.
c. that involves watching and recording consumer behavior.
d. that involves creating an image of a product for the consumer.

Observation is the market research technique  C. that involves watching and recording consumer behavior.

Explanation:

Observation involves using cameras to record the live behavior of the customers. The appointed person goes through the recordings to see and look out for similarities and differences in the purchases of the people. Similarities in purchases can be observed based on price, age group, gender based factors. Differences in purchases arise from different types of people encountered and their convenience. For new customers, decision making duration is more than the existing customers. Also, new prospects spend more time as compared to the old customers.

None   they are   equally likely to occur on any plate boundary