Final answer:
The invasive recording technique that requires placing a microelectrode inside a neuron's cell membrane is Single-unit recording (C).
Step-by-step explanation:
The invasive recording technique that involves positioning a microelectrode inside a neuron's cell membrane is Single-unit recording (C). This method allows researchers to measure the electrical activity from individual neurons, providing detailed information about neural activity. Unlike Single-unit recording, Electroencephalography (EEG) is a non-invasive technique that records overall brain electrical activity using electrodes placed on the scalp. Positron emission tomography (PET) scans involve injecting a radioactive tracer to monitor blood flow and brain activity, while Functional magnetic resonance imaging (fMRI) uses a strong magnetic field to track blood flow and oxygen levels for brain activity over time, but neither of these techniques involves placing electrodes within neurons.