Final answer:
Portfolio investment is not a type of foreign direct investment (FDI), as it involves a purely financial investment with no management responsibility and a short-term focus.
Step-by-step explanation:
The correct answer is C. Portfolio investment is not a type of foreign direct investment (FDI). Foreign direct investment refers to the investment in a foreign country where the investor acquires a significant ownership stake in a company and usually assumes managerial responsibility. It involves a long-term commitment and aims to establish a lasting presence in the foreign market. On the other hand, portfolio investment involves purchasing less than ten percent of a company and is a purely financial investment with no management responsibility. It is often made with a short-term focus and can be withdrawn more quickly than foreign direct investment.