The specialized day to honour Mothers is called
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Mothers' Day
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Fathers' Day
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Mother's Day
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Parents' Day
C
Correct answer
Explanation
The correct name uses singular possessive 'Mother's Day' (apostrophe before s) as it honors motherhood as a concept, not multiple mothers. 'Mothers' Day' with apostrophe after s would incorrectly imply a day belonging to multiple mothers grammatically.