In finance, Beta is a measure of the volatility, or systematic risk, of a security or a portfolio in comparison to the market as a whole. It is a key component of the Capital Asset Pricing Model (CAPM).

Key Interpretations of Beta:

• Beta = 1: The stock's price moves in lockstep with the market. If the market rises by 10%, the stock is expected to rise by 10%.
• Beta > 1: The stock is more volatile than the market. For example, a beta of 1.2 suggests the stock is 20% more volatile than the market.
• Beta < 1: The stock is less volatile than the market. These are often considered 'defensive' stocks.
• Beta = 0: The asset's price movement is uncorrelated with the market (e.g., cash or certain government bonds).

Analysis of other options:

• Option A: Describes Arbitrage, which is the simultaneous purchase and sale of the same asset in different markets to profit from tiny differences in the asset's listed price.
• Option C: Refers to Basis Risk, which arises when the investment or hedge does not move in perfect correlation with the underlying asset, making a perfect hedge impossible.