Which of the Following Statements Is (Are) True Concerning the Three

Which of the following statements is (are) true concerning the three molecules shown?

I. The three molecules are constitutional isomers.
II. Structure C is properly named as a hexane.
III. Structure B has the highest boiling point of the three molecules.
IV. Structure A has the highest boiling point of the three molecules.

A) I and II
B) I, II, and III
C) I and III
D) I and IV
E) I only