Read the small print. It says something along the lines of "count days away for school as days having lived with you". IRS Publication 970 at https://www.irs.gov/pub/irs-pdf/p17.pdf on page 27 clearly states:
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Residency Test
To meet this test, your child must have lived with you for more than half the year. There are exceptions for temporary absences, children who were born or died during the year, kidnap-ped children, and children of divorced or sepa-rated parents.
Temporary absences.
Your child is considered to have lived with you during periods of time when one of you, or both, are temporarily absent due to special circumstances such as
:•Illness,
•Education,
•Business,
•Vacation,
•Military service, or
•Detention in a juvenile facility.
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Therefore when prompted, you will select the option to indicate the student lived with you "the whole year".
