An adult daughter whose mother has bipolar disorder is concerned that she may also have the disorder because she engages in all of the following behaviors Which behavior should be explored further as a manifestation of bipolar disorder?

a. Refusing to her husband to participate in general housekeeping chores

b. Making frequent purchases of expensive clothing that she never wears

c. Having a strong sense of sleepiness daily in the middle of the afternoon

d. crying whenever she looks at a picture of a close friend who died 3 months ago