Which of the following numbers is the largest?
(A) 3.2571
(B) $3 . \overline{2571}$
(C) $3.2 \overline{571}$
(D) $3.25 \overline{71}$
(E) $3.257 \overline{1}$

Part B: Each correct answer is worth 6.
We write out each of the five choices to 8 decimal places:

(A) $3.2571=3.25710000 \ldots$

(B) $3 . \overline{2571}=3.25712571 \ldots$

(C) $3.2 \overline{571}=3.25715715 \ldots$

(D) $3.25 \overline{71}=3.25717171 \ldots$

(E) $3.257 \overline{1}=3.25711111 \ldots$

These five real numbers agree to four decimals, but are all different in the fifth decimal place. Therefore, $3.25 \overline{71}$ is the largest.

ANSWER: (D)