Problem
Which option is an example of a survey? A. Having customers who bought a certain type of car answer questions about their satisfaction with the car B. Measuring the heights of the players on the basketball team C. Testing the effectiveness of a new reading program by allowing a classroom to use it and comparing the results with another classroom that doesn't use it D. Flipping a coin 50 times and counting the number of heads
Solution
Step 1 ：Identify which option involves asking people questions to gather information or opinions
Step 2 ：Option A involves asking customers questions about their satisfaction with a car, which is a survey
Step 3 ：\( \boxed{\text{Final Answer: A. Having customers who bought a certain type of car answer questions about their satisfaction with the car}} \)
