The smallest positive number which must be added to the greatest number of 4 digits in order that the sum may be exactly divisible by 307 is:

Correct option is C

Given:

Greatest 4-digit number: 9999
Divisor: 307
Solution:

Divide 9999 by 307:
99$$99 \div 307 \approx 32.57$$​
Take the next whole number (33) and multiply by 307:
$$307 \times 33 = 10131$$​
Subtract 9999 from 10131:
10131 - 9999 = 132