Read the paragraph below and answer the questions that follow.
(1) According to researchers, babies can be classified according to their temperament, the general pattern of their emotional reactions to their environments. (2) In the first category are the "easy" babies, who account for about 40 percent of all babies. (3) They are usually in a positive mood, and they adapt well to new situations. (4) Another category contains the "difficult" babies, who make up about 10 percent of all infants. (5) They are often in a bad mood, and they exhibit signs of stress when placed in new situations. (6) The next group, the "slow-to-warm-up" babies, account for 15 percent of all infants. (7) They are moody, and they struggle to adapt to new experiences, but to a lesser degree than the "difficult" babies. (8) In the last group are the "mixed-pattern" babies, the 35 percent of infants who do not fall clearly into any of the other three groups because their moods and reactions are less predictable.
On what basis does the writer classify babies?

A) temperament characteristics
B) intelligence
C) ability to learn

The following sentences form a paragraph. For each pair, select the answer with more sentence variety. Which answer choice has sentence variety?

A) Her future husband was a dynamic young man. He was named Barack Obama. He interned at her firm. They soon married. They waited several years before having two girls.
B) Her future husband, a dynamic young man named Barack Obama, interned at the firm. They soon married, waiting several years before having two girls.