The correct answer is: a) June & July.
Arunachal Pradesh is a state in northeastern India. It is the largest state in the country by area, and it is also one of the most sparsely populated. The climate of Arunachal Pradesh varies from tropical in the south to temperate in the north. The hottest months in Arunachal Pradesh are typically June and July, when the average temperature ranges from 25 to 30 degrees Celsius. The monsoon season in Arunachal Pradesh typically lasts from June to September, and during this time, the state receives heavy rainfall.
The other options are incorrect because they are not the hottest months in Arunachal Pradesh. May and June are the second and third hottest months, respectively. April and May are the warmest months, but they are not as hot as June and July. March and April are the mildest months in Arunachal Pradesh.