The Ural mountains form the border between...

The Ural mountains form the border between all of the following EXCEPT :
a. the north European lowlands and west Siberian plain
b. the taiga and the steppe
c. the continent of Europe and the continent of Asia
d. European Russia and Siberia

all of the following EXCEPT B.the taiga and the steppe

c. the continent of Europe and the continent of Asia

The Urals run in the north-south direction through western Russia, from the coast of the Arctic Ocean to the Ural River and northwestern Kazakhstan. Their eastern side is usually considered the natural boundary between Europe and Asia.

Edit: I misread your question, my answer above is wrong. Sue me please. Blonde has the right answer, it's b.

b.
Between taiga and steppe there are temperate forests. Climate zones change from the south to the north. While Ural mountains divide west and east. From both sides of Ural there are taiga forests and steppes.

The Urals are normally considered to be the boundary between Europe and Asia.

C.

The answer is C