If Double Radio Sources, Quasars, and Blazars Are Considered to Be

If double radio sources, quasars, and blazars are considered to be the same basic object, why do they appear to us to have very different and distinct properties?

A) because the relativistic particles in the double jets are different in each case: electrons in double radio sources, protons in quasars, and quarks in blazars
B) because they are at different distances from us, and we see more detail and different properties on those that are closer to us
C) because we are viewing them at different angles to the line of the double jets emitted from their cores
D) because they are of different ages

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