The Semite, Bhagwat, and Yankee (2018) study found that board diversity, particularly in thought and experience, helps reduce stock return volatility by:

Enhancing risk management through better decision-making.

Reducing governance failures by avoiding groupthink.

Encouraging long-term investment strategies that contribute to stable financial performance.

Why not A or C?

A is incorrect because diverse boards do not necessarily reduce R&D investment; in fact, some studies suggest they may promote more innovative decision-making.

C is incorrect because greater homogeneity (lack of diversity) often leads to poor governance outcomes, not higher profitability.