Final answer:
The emotions of participants can be recorded on paper using self-report questionnaires, which is option C). EEG and fMRI measure brain activity while heart rate monitoring measures cardiac activity, neither of which directly record emotions on paper.
Step-by-step explanation:
The emotions of participants in a study can be recorded using several techniques. The correct answer to the question would be C) Self-report questionnaires. This method involves asking participants to describe their emotional experiences, usually by completing a survey or questionnaire. It's a subjective approach but can be very useful for gaining insights into individuals' personal experiences of emotion.In contrast, Electroencephalogram (EEG) and Functional Magnetic Resonance Imaging (fMRI) are used for measuring brain activity. EEG measures the electrical activity of the brain with accuracy within milliseconds and is particularly useful for research on brain functions like sleep patterns. fMRI tracks changes in blood flow and oxygen levels in the brain, providing detailed images of brain activity over time. Although EEG and fMRI offer objective measures of neurological activities that may underlie emotions, they do not directly record subjective emotional experiences on paper. Lastly, Heart rate monitoring is another objective measure that can sometimes be used to infer emotional state but again does not directly capture subjective experience.