Final answer:
The question asks if Darren's parents can claim him as a dependent based on his age, disability, and earnings. However, further information regarding Darren's student status is needed to provide a complete answer.
Step-by-step explanation:
In this question, we are asked to determine if Darren's parents can claim him as a dependent based on his age, disability, and earnings. According to the information provided, Darren is 20 years old and not disabled, and he earned $4,100 in 2017.
The question states that Darren's parents cannot claim him as a dependent unless he is a full-time student. Since the question does not specify whether or not Darren is a full-time student, we cannot determine if his parents can claim him as a dependent based on the given information. Additional information regarding Darren's student status is needed to answer the question fully.