Answer:
a. Inflation
Step-by-step explanation:
In the context of economics, inflation refers to the increase in the price of goods and services
Moreover, we also know that
(1 + Nominal rate of return) = (1 + real rate of return) × (1 + inflation rate of return)
According to the given situation, it is mentioned that The general goods and services prices are expected to rise substantially over the next five years which represents the concept of inflation
Hence, the option a is correct