Evidence for evolution that can be obtained from fossils is transitional stages of the extant species, as stated in the second answer option (B. transitional stages). This is possibly due to for a known fossil, there can be found a new fossil related, which can be a variation of that former species, but also a previous form of a currently existing species, as we can see in the following picture, where the three images of teeth in the middle, corresponds to transitional stages between the two different teeth of each extreme of the picture (: