A. This is an assumption. Research evidence and references to support this statement are absent.
B. This is an observation. The percentage of women completing college has increased markedly.
C. This is an inference. The Elderhostel movement and adult education are discussed, but the section lacks supporting statistical information.
D. This is an inference. The statistics clearly show that the level of education has consistently increased through recent years, but the predicted trend is an extrapolation from the observation.
E. This is an inference. The explanation in this section is not supported by data.