Option B
A. If there is a striking white patch on the rump under the tail it never extends above the tail.
B. There is never a black horizontal stripe on the side.
C. The eyes may or may not be surrounded by a white patch and have a vertical black line running through it.
Select

There are 2 species known in Tanzania: Gazella granti (Grant's Gazelle) and Gazella thomsonii (Thomson's Gazelle). In the picture to the right the animal on the left side is a Grant's gazelle (note that the white extends above the tail) and the animal on the right is a Thomson's gazelle (note that the white does not extend above the tail). The gazelles are common residents of grassland and woodland areas.