Ethanol and Dimethyl Ether Molecules Both Contain Two Carbon Atoms

Ethanol and dimethyl ether molecules both contain two carbon atoms, six hydrogen atoms, and one oxygen atom.Which statement is true?

A) Their molecular formulas are different.
B) They show the same physical properties but different chemical properties.
C) The arrangement of the atoms in each type of molecule is different.
D) Their melting points and boiling points are the same.
E) There is no physical method that can distinguish between the two.