Correct answer: A. To estimate future market changes
Explanation: Direct answer: Option A is correct. Forecasting means making a careful estimate about future conditions by studying available information, past trends, and likely changes. In strategy, a business must think about future demand, competitors, technology, customer preferences, prices, and other market conditions. Forecasting does not provide a perfect prediction, but it helps managers prepare alternatives and choose a suitable direction. Therefore it is useful for estimating future market changes. Option A is correct because this is directly connected with strategic planning. Option B is wrong: measuring tea sweetness is a quality or food-related task, not forecasting in strategy. Option C is wrong: observing chair colour has no meaningful connection with predicting market conditions. Option D is wrong: folding a file is a physical office activity and does not help a business understand the future market. The correct reasoning is: information about the present and past is analysed, possible future changes are estimated, and strategy is adjusted. Memory cue: forecasting looks ahead; strategy uses that forward-looking information to decide what to do.