Final answer:
The people's belief in the imposter cannot be determined based on the given information.
Step-by-step explanation:
The question asks whether the people at the brick kilns believed the individual who claimed to be their Czar. Based on the information provided, it cannot be determined whether they believed him or not. The given references do not provide specific evidence or details about the beliefs of the people at the brick kilns. Therefore, the answer to the question is 3) Cannot be determined.