Which of the following statements is false?

a.
an amendment can be proposed by a 2/3 vote in the house of representatives.

b.
an amendment can be proposed a national convention called by congress at the request of 2/3 of the state legislatures.

c.
an amendment can be ratified by approval of state legislatures in 3/4 of the state legislatures.

d.
an amendment can be ratified approval of conventions held in 3/4 of the state.