Answer:
C. No, because Isabella has an ITIN
Explanation: For claiming Earned income credit, each person should have a valid SSN and fall under the specified earned income limits.
Felix and Isabella are filing jointly and their income is only $50,000(limit is $52,493) which qualifies them with one criteria.
But, all the person's mentioned in the return need to have SSN but Isabella a resident alien has only ITIN. Hence, they cannot claim earned income credit for the year 2019-2020