While reading a novel, raoul isn't easily distracted by the sounds of the television or even by his brothers' loud arguments. this best illustrates

Concentration

Explanation:

Raoul is concentrated on his work, therefore, he isn't distracted

c

explanation:

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 : )