Which of the following is the mosquito free country?

A. Ireland
B. Switzerland
C. Iceland
D. Belgium

Iceland 🇮🇸 is the mosquito free country in the following because there are several theories why, such as:

1. They have not reached Icelandic soil from the planes they are carried by

2. If they reach Icelandic soil, then they have not found a place to lay their eggs

3. The mosquito life cycle does not suit Icelandic conditions