Each of the positive integers a and c is a four-digit integer. If each of the digits 0 through 8 appears in one of these three integers, what is the minimum possible value of the sum of a and c?	Choose the correct choice from the following options
A) 3768  B) 3789  C) 3850  D) 3825  E) 3875
According to the stem we should use the digits 0 through 8 to construct 2 four-digit integers, so that their sum is as small as possible.   To minimize the sum, minimize the thousands digits of a and c, so make them 1 and 2.   Next, minimize hundreds digits. Make them 3 and 4 .   Next minimize 10's digit place by 5 and 6   Use the remaining digits (7,and 8) for units digits.   So, a would be 1357,and c would be 2468.   1357 + 2468= 
<gadget id="calculator">1357 + 2468</gadget>
<output>3_825</output>
3825   Answer: 3825.
<result>D</result>
Each of the positive integers a and c is a four-digit integer. If each of the digits 0 through 8 appears in one of these three integers, what is the minimum possible value of the sum of a and c?