C. Sedimentary
Explanation: It is sedimentary rock because sedimentary rocks are formed by the accumulation or deposition of mineral or organic particles at the earths surface, followed by a process known as cementation.
One situation that would definitely NOT lead to an increase in productivity is
D. an increase in the cost of factors of production .
An increase in the cost of production would rather lead to a decrease in productivity - it would make the production more difficult.
