Obviouslyseparating these different species

Some species of Anopheles mosquito livein brackish water, some in running fresh water, and others instagnant water. What type of reproductive barrier is most obviouslyseparating these different species?

    a. habitatisolation    
    b. temporalisolation    
    c. behavioralisolation    
    d. gameticisolation    
    e. postzygoticisolation

"Is this question part of your assignment? We can help"