D$.$ $$57396.$ When determining if a taxpayer qualifies for the Joint Custody Head of Household Credit, he or she must have kept up the taxpayer's home as a household that was the main home for the taxpayer's unmarried child, stepchild, or grandchild; or married child, stepchild, or child's descendant whom the taxpayer could claim as a dependent for at least how many days of the year?A$.100$ daysB. $146$ daysC. $150$ daysD. $157$ days