Answer: Single
Step-by-step explanation:
Ann provided over half of John's support and therefore normally she can claim him as a dependent on her tax return which would make her a Head of Household. However, for him to be claimed as a dependent on 2019, his income would have to be less than $4,150. John's income in this scenario is $4,300 which is higher than the limit. Ann therefore cannot claim John on her tax return and because she is unmarried, she will have to file as a Single person.