Please read the following excerpt from an essay, and answer the question that follows.
Biologically, adolescence is marked by hormonal changes that produce secondary sexual characteristics.
These include breast development in females and beard growth in males. Psychologically, however,
adolescence is a concept that applies only to modern industrial societies. In fact, in most preliterate or tribal
societies, the modern American idea of adolescence simply does not exist. In such societies, the social roles
of adulthood are to be learned during childhood. Then, around the time of biological puberty, a child
becomes an adult through a ritual anthropologists call a rite of passage. By contrast, in American society,
adolescence amounts to a sort of social and cultural limbo. Informally, the end of childhood is often
marked by one's thirteenth birthday. The child is now a "teenager." More formally, the end of adolescence
is marked by legal strictures that vary irrationally. In a given state the age of sexual consent may be 16 for
girls and 18 for boys. An 18-year-old may vote or enlist to die for his country, but, until he reaches age 21,
he may not legally purchase alcoholic beverages.
If the topic of this paragraph is adolescence, which of the following statements best captures or reiterates
the thesis?
A. Western society has no single concept of adolescence.
B. Adolescence is an aspect of modern society.
C. Adolescence is an irrational concept.
D. Adolescence is defined differently in different societies.
my answer is b.