Answer :
Based on the fact that Malcolm is a U.S. citizen and provided 100% of the support for his son, who lived with him all year and is his qualifying child, his most advantageous filing status is D. Head of household.
It should be noted that Malcolm can file a separate return from his ex-wife as the head of household. This is due to the fact that he stayed with his son and paid 100% maintenance for the son.
Under the head of household, the gross income is $18650 for those under the age of 65. Malcolm can also get dependent care credit, earned income credit, and education credit.
Therefore, he should file as head of household.
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