The positive reaction in Colgate-Palmolive's stock price is directly attributable to the company's Q1 earnings outperformance and the optimistic adjustment to its future sales growth outlook. Investors typically respond well to earnings beats and upward revisions in financial forecasts, as these are indicators of a company's strong performance and future potential. The direct mention of these achievements in the report makes it highly relevant and important for investors, leading to a high confidence in the short-term positive impact on the stock.