Describe the concept of risk tolerance.

Risk tolerance refers to an investor's ability and willingness to endure fluctuations in investment values. This concept encompasses both psychological and financial aspects — it takes into account not just how much risk an investor is capable of handling based on their financial situation but also how comfortable they feel with the inherent unpredictability of market fluctuations.

Understanding risk tolerance is crucial for tailoring investment strategies that align with an investor's financial goals, time horizon, and emotional responses to losses or gains. Investors with high risk tolerance are typically more willing to accept short-term volatility for potentially higher long-term returns, while those with lower risk tolerance may prefer more stable, lower-risk investments to avoid significant swings in their portfolio's value.

The other options touch on aspects of investing but do not adequately capture the essence of risk tolerance. For instance, a preference for aggressive investment strategies reflects a willingness to take more risk but does not encompass the full range of factors that contribute to risk tolerance. Similarly, the ability to diversify a portfolio is a strategy for managing risk rather than a definition of how much risk an investor can tolerate. Lastly, a commitment to long-term investment suggests a strategy but does not specifically address an individual’s comfort level with the risks involved over time.