Which of the following favours the formation of rift valleys?

I. Tensional forces in the earth’s crust

II. Compressional forces in the earth’s crust

III. Lateral forces in the earth’s crust

IV. The subsidence of the rift valley floor

A. I and III only
B. I,II and IV only
C. I and II only
D. II and III only

Correct Answer:

Option A – I and III only