Ive been waiting for a while now i dont have much time to answer this plz someone

carol and her lab partner were trying to estimate the number of volvox colonies in a 10 milliliter sample of pond water. the colonies were too small to count with a hand lens. carol suggested putting a sample of water on a microscope slide and counting the colonies per drop of water. then they could figure how many drops of water were in 10 milliliters.

to get the most accurate measurement of the number of colonies, what power magnification should they use and why?
a) it does not really matter which magnification they use as long as they count accurately.
b) they should use the oil immersion lens with 400x to slow down the colonies and see as many as possible.
c) the should use the lowest magnification, which gives them the largest field of view and lets them see entire colonies to count.
d) they should use the 100x magnification to give the largest field of view allowing them to see as many colonies as possible at one time.