Answer:
The correct option is B: By signing the bottom of this form, you consent to being recorded.
Step-by-step explanation:
This scenario here is an interview, but it also looks like a research and involves filming a person or group of people. In this case, privacy and confidentiality matter arises, and it is mandatory that before filming a group of people for the purpose of making a decision regarding what is filled, their consent must be taken. Hence, the best sentence that fits the end of this paragraph is a sentences that ensures they are aware and give their consent to being recorded.