For the following molecules: acetone, benzene, diethyl ether and ethane (each of which contains only one...

For the following molecules: acetone, benzene, diethyl ether and ethane (each of which contains only one type of proton) the correct order of chemical shift (in δ units) is which of the following?
Select one:
Benzene > diethyl ether > acetone > ethane
Benzene > ethane > acetone > diethyl ether
Benzene > acetone > diethyl ether > ethane
Benzene > acetone > ethane > diethyl ether
Which of the compounds shown below would be most consistent with the mass spectrum shown below:
Select one: