Constitution: Why and How?

Which of the following is a good reason to conclude that the
authority of the constitution is higher than that of the parliament?
a. The constitution was framed before the parliament came into
being.
b. The constitution makers were more eminent leaders than the
members of the parliament.
c. The constitution specifies how parliament is to be formed and
what are its powers.
d. The constitution cannot be amended by the parliament.