1. (8 points) The largest three-digit number divided by an integer, the quotient rounded to one decimal place is 2.5, the smallest divisor is ( )
A. 400
B. 396
C. 392
D. 388
【Solution】Solution: The largest three-digit number is 999
2.5 is obtained by rounding. It can be approximately in the range of 2.45 - 2.54, the smaller the divisor, the larger the quotient.

Keeping one decimal place, the maximum value that can be obtained as 2.5 is infinitely close to $2.5, 2.54 \dot{9}$
$$
999 \div \text { integer } \approx 2.54 \dot{9}
$$
$999 \div 2.54 \mathrm{~g} \approx 391.8$ The integer that meets the condition is 392
Therefore, the answer is: $C$.