A. This is an observation. Much explanation and data follow to support this statement.
B. This is an assumption. In the text the conclusion is qualified with “possibly,” but no research is presented to support the hypothesis.
C. This is an inference. Explanations and conclusions support the statement.
D. This is an inference. Explanations and conclusions follow the statement.
E. This is an observation. About 5 to 7 percent of couples remain childless by choice.