The correct answer is option 2: 40-100 cm.

In the dotted area on the map of India, the average annual rainfall ranges from 40 to 100 centimeters.

This means that in this region, the amount of rainfall received each year falls within this range.

It is important to note that this is an average value, and the actual rainfall in any given year may vary from the average.

Additionally, the distribution of rainfall within this region may also vary, with some areas experiencing higher or lower amounts of rainfall compared to others.

It is essential to consider the average annual rainfall when studying climate patterns and determining the suitability of certain activities or crops in a particular region.

Therefore, option 2 is the correct answer, representing the average annual rainfall range in the dotted area of the map of India.