Given below are four sentences, three of which, are jumbled. Pick the option that gives the correct order.
A. Monarch butterflies migrate in millions to California and Mexico each winter.
B. North American Monarchs are the only butterflies that undertake such a long journey.
C. The intense cold would kill them if they delayed their journey.
D. The insects start this journey each year in autumn.

A

ABCD

B

ACDB

C

ACBD

D

ABDC