Question

Cosmology is the scientific study of the universe as a whole. Scientists construct models or theories to explain its structure, origin and possible future, using assumptions that do not conflict with what can be observed. _____. If fresh evidence contradicts a model, that model has to be revised, replaced or abandoned. Cosmologists generally assume that, except for minor irregularities, the universe appears broadly similar to all observers.

A This allows them to investigate the background of cosmic events in greater detail
B Such theories give complete answers about how human life first came into existence
C Scientists continue to use a model only as long as observation does not contradict it
D They use advanced instruments to make precise predictions about the future of mankind
E These observations have finally proved that the universe is eternal and unchanging
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