Final answer:
The answers given by survey respondents in Paragraph 6 may have been easily influenced.
Step-by-step explanation:
The passage indicates that the answers given by survey respondents in Paragraph 6 (Lines 63-79) may have been easily influenced.
One potential weakness of surveys is that people don't always give accurate responses. They may lie, misremember, or answer questions in a way that they think makes them look good. This suggests that the respondents' answers in the survey may have been influenced by external factors, making them easily influenced.
Therefore, the correct answer to the question is C) easily influenced.