Final answer:
The question does not provide the necessary information to determine the correct answer.
Step-by-step explanation:
In the given question, we are asked to determine how many subjects were randomly selected from an online group involved with ears in a study on cell phone usage and brain hemispheric dominance.
Unfortunately, the information provided does not include the specific number of subjects randomly selected from this particular group. Therefore, we cannot determine the correct answer from the given options.