What type of risk might an investor assess using the 'Greeks'?

The Greeks are a set of metrics used in options trading and derivatives markets to assess various dimensions of risk related to the price movements of underlying assets. Specifically, they measure how sensitive the price of an option is to changes in different variables, such as the price of the underlying asset, time decay, and volatility.

Selecting the correct option acknowledges that the Greeks encompass multiple types of risk. For instance, Delta measures the sensitivity of an option's price to changes in the price of the underlying asset, while Vega assesses the impact of volatility on an option's price. Theta gauges time decay, and Rho looks at the sensitivity to interest rate changes. These measures provide a comprehensive understanding of the risks involved in trading derivatives, rather than isolating the analysis to a single dimension or type of financial risk.

The focus on derivatives, such as options, highlights the multifaceted nature of risk assessment in that market. Therefore, option C correctly identifies that the Greeks are used to evaluate various dimensions of risk in derivatives, making it the appropriate choice in this context.