The correct answer is 60 because KPK (Least Common Multiple) is the smallest number that is divisible by both 20 and 30. The factors of 20 are 1, 2, 4, 5, 10, and 20, while the factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30. The common factors are 1, 2, 5, and 10. To find the KPK, we can multiply the highest power of each common factor, which gives us 2^1 * 5^1 * 10^1 = 60. Therefore, 60 is the KPK of 20 and 30.