Introduction:
The introduction of equipment like recorders can have various impacts on individuals. In this case, the respondent's reaction is being considered. According to the given options, the correct answer is option 'C', which states that the respondent feels uneasy when such equipment is introduced.

Explanation:
1. Recorders as a form of surveillance:
- The use of recorders can often be associated with surveillance or monitoring activities.
- This can lead to feelings of uneasiness and discomfort among individuals who are being recorded.
- The presence of recorders may make respondents feel like their actions are being monitored or scrutinized, which can be unsettling.

2. Lack of privacy:
- The introduction of recorders can also raise concerns about privacy.
- Individuals may feel uneasy knowing that their conversations or activities are being recorded without their consent.
- This lack of privacy can lead to discomfort and a sense of unease among respondents.

3. Fear of being judged or recorded:
- Respondents may worry about their words or actions being recorded and potentially used against them.
- This fear of being judged or recorded can contribute to feelings of uneasiness when recorders are introduced.
- It may make respondents reluctant to express themselves freely or act naturally, leading to discomfort.

4. Unfamiliarity and distrust:
- If respondents are unfamiliar with the equipment or its purpose, they may feel uneasy due to the unknown.
- Lack of trust in the intentions or handling of the recorded data can also contribute to discomfort.
- The introduction of recorders may raise concerns about the potential misuse or mishandling of recorded information.

5. Overall impact:
- Considering these factors, it is understandable why the respondent's overall reaction is described as uneasy.
- The introduction of recorders can disrupt the sense of privacy and personal freedom, leading to discomfort and uneasiness.

In conclusion, the introduction of equipment like recorders often makes respondents feel uneasy. This uneasiness can be attributed to factors such as the association with surveillance, the lack of privacy, fear of being judged or recorded, unfamiliarity, and distrust.