Which of the Following Best Describes the Current Status of Our

Which of the following best describes the current status of our understanding of the solar neutrino problem?

A) Experimental evidence indicates that the problem is solved and the expected number of solar neutrinos are indeed being produced by the Sun.
B) The problem arose only because experimental data were being misinterpreted;on re-examination,the old data showed that the expected number of neutrinos were being detected.
C) We have learned that the Sun's interior undergoes fusion at a lower rate than we had expected,and that is why we had observed fewer neutrinos than expected.
D) The solar neutrino problem remains as perplexing as ever,and indeed makes everything we think we know about stars suspect.