First one who answers gets the thing

A construction company recently filled in a local pond to build new houses. During
the following weeks, a local scientist noticed a decline in the mosquito population in
the area. The scientist wants to conduct a study that will measure the change in the
local mosquito population over a period of three months. Which research method
would give the scientist the best data for conducting his study?

A/ a collection device in the area that counts the number of mosquitoes caught
weekly.

B/ a three-month case study observing the behavior of animals that depend on
mosquitoes for food.

C/ a controlled lab experiment with mosquitoes that limits water access for the
experimental group.

D/ a survey asking residents about their observations of the local mosquito
population.