Jeremy (age 21) is a student (and US taxpayer) who works part-time during school breaks. In 2021 he earned $5,000 from all of his jobs. His parents gave him $4,000 as a gift in 2021. Jeremy wants to start investing for his retirement after listening to some old bald guy talk about the importance of starting to invest for retirement as early in life as possible. What is the maximum that Jeremy can invest in his Roth IRA for tax year 2021? O A. $4,000 OB. $10,000 O C. $9,000 D. $5,000