According to the Textbook,the Increase in the Number of Adults

According to the textbook,the increase in the number of adults who report no religious affiliation ("the rise of the nones") is largely explained by

A) a lack of diversity in choices of religions.
B) generational replacement,since more millennials are religiously unaffiliated.
C) an overabundance of religious choices,which decreases the sacred quality of religion.
D) a response to the rise in religious nationalism.