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The Leading Price-to-Earnings (P/E) ratio is a crucial measure used by investors to assess the valuation of a company's stock based on its expected future earnings. It is calculated using the formula (1 - b) / (r - g), where 'b' represents the retention ratio (the proportion of earnings retained in the business rather than distributed as dividends), 'r' indicates the required rate of return on the equity, and 'g' signifies the growth rate of earnings.

This formula reflects the relationship between the expected growth of a company's earnings, the required return on investment, and the portion of earnings reinvested. The calculation serves to provide investors with a forward-looking perspective by projecting future earnings growth while accounting for the risk represented by the required return. Essentially, it helps compare the intrinsic value of a stock relative to its current price based on its anticipated growth trajectory.

In contrast, the other options do not align with how the Leading P/E ratio is actualized in financial analysis. They involve different relationships among growth rates, retention ratios, and return rates that do not accurately produce the Leading P/E ratio. Therefore, utilizing the correct formula is essential for determining an accurate valuation metric in equity analysis.