Final answer:
Option A is an example of an experiment where the effectiveness of a new reading program is being tested by comparing the results of a classroom using it with another classroom that doesn't use it. This is a controlled experiment where the independent variable (use of the reading program) is manipulated to measure the dependent variable (results).
Step-by-step explanation:
Option A is an example of an experiment. In this option, the effectiveness of a new reading program is being tested by allowing one classroom to use it and comparing the results with another classroom that doesn't use it. This is a controlled experiment because the researcher can manipulate the independent variable (use of the reading program) and measure the dependent variable (results) to determine if there is a cause-and-effect relationship.