I would say D because it involves more selection but if that one is wrong it is most likely B. But I would go with D
a mass of igneous rock, typically lens-shaped, that has been intruded between rock strata causing uplift in the shape of a dome. :)
A and b are cells so they definitely are not bacterium so c and d are bacterium I think. Your welcom.
Y=-10x+110 i think that is right because the equation for slope is y equals mx plus be:))