Answer:
a. Marsha is required to file a tax return.
Step-by-step explanation:
Since in the question it is mentioned that Marsha who is 23 years old and single she earned $18,500 wages and federal income tax of $1,500 also Shelby and Marsha are U.S citizens
So as per the given situation she needs to file a tax return
Hence, the correct option is a
And, the same is to be considered