The Davis Neutrino Detection Experiment Measured Only About One-Third of the Expected

The Davis neutrino detection experiment measured only about one-third of the expected solar neutrino flux. The Kamiokande experiment was a great improvement. Why?

A) It detected two-thirds of the expected rate.
B) It was able to detect neutrinos all across the energy spectrum and measured the expected neutrino flux.
C) It was able to measure the direction of the neutrinos it counted and thus confirm their solar origin.
D) It was able to detect neutrinos of all three types.