Which of the following sets of Dewey Decimal call numbers is in the correct order?

A. 010.1 ABR, 004.15 KWA, 100.01 PRO, 100.1 BLU
B. 100.1 BLU, 010.1 ABR, 004.15 KWA, 100.01 PRO
C. 100.01 PRO, 100.1 BLU, 010.1 ABR, 004.15 KWA
D. 004.15 KWA, 010.1 ABR, 100.01 PRO, 100.1 BLU

To determine which set of Dewey Decimal call numbers is in the correct order, we need to understand how Dewey Decimal System works. The Dewey Decimal Classification (DDC) is a system used to organize library materials by subject. It uses a numerical system to classify books into different broad categories.

In the Dewey Decimal System, the numbers before the decimal point represent the main subject areas, while the numbers after the decimal point further classify the subject into more specific topics. The system follows a hierarchical structure, from broader to narrower topics.

To determine the correct order of the call numbers in the given options, we need to compare the numbers before the decimal point first. In this case, the numbers are 010.1, 004.15, 100.01, and 100.1.

Comparing the numbers directly, we can see that 004.15 is the smallest number, followed by 010.1, 100.01, and 100.1. Therefore, the correct order of the call numbers from smallest to largest is 004.15 KWA, 010.1 ABR, 100.01 PRO, and 100.1 BLU.

Looking at the given options, we can see that option D. 004.15 KWA, 010.1 ABR, 100.01 PRO, 100.1 BLU matches the correct order.

So, the correct option is D. 004.15 KWA, 010.1 ABR, 100.01 PRO, 100.1 BLU.