I think the correct answer from the choices listed above is option A. The microscope that Jack used is a light microscope. This type of microscope uses slides where a sample to be observed is placed. Also, it has a light source in order to have clear observations.
Hubble's brilliant observation was that the red shift of galaxies was directly proportional to the distance of the galaxy from earth. That meant that things farther away from Earth were moving away faster. In other words, the universe must be expanding.