Which Statement About Alkanes, Alkenes, and Alkynes Is Not Correct

Which statement about alkanes, alkenes, and alkynes is not correct?

A) Alkanes are much less reactive than alkenes and alkynes.
B) The melting and boiling points increase as the number of carbon atoms in a normal alkane increases.
C) When they have the same number of carbon atoms, branched alkanes have lower melting and boiling points than normal alkanes.
D) Alkenes and alkynes, but not alkanes, undergo addition reactions.
E) Cis and trans stereoisomers occur in both alkenes and alkynes.