Final answer:
The correct order of the decimal numbers from least to greatest is 1.25, 1.5, 1.6, 1.75.
Step-by-step explanation:
The correct option is c) 1.25, 1.5, 1.6, 1.75. The given numbers are decimal numbers, and to order them from least to greatest, we compare their values. Starting with the tenths place (after the decimal point), we see that 1.25 has the smallest value, followed by 1.5, then 1.6, and finally 1.75, which has the greatest value.
Learn more about Ordering decimal numbers