Which of the Following Is NOT an Experiment That Is

Which of the following is NOT an experiment that is searching for neutrinos coming from the Sun?

A) looking for radioactive argon atoms in a tank of cleaning fluid deep in an underground mine
B) looking for changes in the Doppler shift of lines in the atmosphere of the Sun
C) looking for radioactive gallium in a vast quantity of ordinary gallium
D) looking with sensitive light meters in a giant vat of pure water deep underground in Japan
E) all of the above are ways to search for neutrinos