6000 can be written as 2^4 * 5^3 *3.
therefore any divisor of 6000 can be formed by taking any combination of the above factors.
so for '2' there are 5 choices whether to include it or not in the divisor of 6000.
similarly for '5' there are 4 choices and for '3' there are 2 choices.
therefore total no of choices = 5*4*2 = 40.
there (A) is the correct answer.