Which of These Is a Drawback of Using Brain Recording

Multiple Choice

Which of these is a drawback of using brain recording techniques in scientific studies?

A) The brain recording techniques can cause permanent changes to cognition and comprehension.
B) Brain recording techniques do not allow researchers to make connections between cognitive processes and brain function.
C) The machines and technologies can be expensive and require extensive time from research subjects.
D) The procedures are all invasive and can require ingestion of radioactive substances.