Use the HR diagram below to answer the question. Labeled HR diagram. The main sequence slopes from the upper-left of the diagram, which is blue, to the bottom-left of the diagram, which is red-orange. White dwarfs cluster at the bottom of the diagram, in the light blue section. Red giants cluster in the middle of the diagram, in the orange-red section. Red supergiants cluster at the top of the diagram, in the orange-red section. What can be concluded about the initial mass of a blue main sequence star compared to a red main sequence star? Blue main sequence stars had a greater initial mass. Red main sequence stars had a greater initial mass. Blue main sequence stars have the same initial mass as red main sequence stars. Initial mass comparisons cannot be made between blue and red main sequence stars.