Alternative splicing means that:
a. some transcripts are spliced correctly and others incorrectly.
b. alternating introns are removed.
c. different spliced forms contain different combinations of exons.
d. some transcripts are spliced while others are not.

c) different spliced forms contain different combinations of exons.

Explanation:

alternative splicing is the process of producing different combination of exons  of the same gene

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )

the answer is b. glad to .