The correct answer is diversification.
Diversification is an investment strategy in which an investor spreads out their investments among many different types, such as stocks, bonds, real estate, and commodities. The goal of diversification is to minimize risk and maximize returns by avoiding having all investments in one asset class or industry.
Option (A) "equity investments" refers specifically to investments in stocks. Option (B) "investing" is a broad term that could refer to any type of investment, and is not specific enough to describe the concept of spreading investments across multiple types. Option (D) "overdraft" refers to a banking term where a withdrawal is made from an account that exceeds the available balance, and is not related to investment strategies.