Which of the following dependents is required to file a tax return?

Sue (58) is single and a dependent of her son, with whom she lives. In 2019, Sue had $1,250 in dividend income and $3,800 in earned income.

Nick (17) earned $3,600 working at a local coffee shop. He also received $56 in interest on his savings account.

Merna (19) is a full-time student at Your State College. She earned $5,500 working at a local grocery store.

Marvin (68) and Donna (69) are married filing jointly with gross income of $26,790.