Explanation:

Here’s the breakdown:

- Option 1: 1st October

This is the date set aside globally as International Day of Older Persons. It’s about recognizing the contributions of older people and raising awareness about challenges they face.

- Option 2: 2nd October

That’s Mahatma Gandhi’s birthday, known as Gandhi Jayanti in India, but not related to older persons internationally.

- Option 3: 3rd October

Nothing specific on this day about older persons. It’s just a regular day in terms of international observances.

- Option 4: 4th October

Again, not linked to International Day of Older Persons. For some religions, it’s the feast day of St. Francis of Assisi, but that’s not connected here.