Explanation:

• A (Correct): A price-weighted index is biased when high-priced stocks split because the weight of the stock in the index is determined by its price. After a split, the stock's price declines, reducing its weight in the index, regardless of the stock's market significance.

• B (Incorrect): In an equal-weighted index, each stock's percentage price change carries equal weight. A stock split does not affect the index's outcome because the weighting is not price-dependent.

• C (Incorrect): A value-weighted index automatically adjusts for stock splits and other capital changes. Therefore, splits do not introduce bias into the index.