Заполнить предлогами my younger brother,Ken,was born (1)______ the 1st of march

Question

Заполнить предлогами my younger brother,Ken,was born (1)______ the 1st of march

Answer 1

On, это вроде элементарно

Answer 2

my younger brother,Ken,was born (1)___ON ___ the 1st of march

перед датами употребляется on