On which of the following days is World Athletics Day celebrated every year?

In which of the following countries was the first international conference on moving away from fossil fuels held? 

Which state has become the first in India to complete all 51 priority reform areas under the Central Government’s Compliance Reduction and Regulation Initiative?

On which of the following days is the International Day of Families celebrated every year?

What is the name of India’s first autonomous combat aircraft, which is being produced in Portugal?