Final answer:
The sequence 23, 38°, 80° is the correct order from least to greatest, as it lists the angles in ascending order of their sizes.
Step-by-step explanation:
The correct order from least to greatest of the options provided is c) 23, 38°, 80°.
When looking at angles, their magnitude is measured in degrees and directly indicates their size. The sequence provided in option c) lists the angles in ascending order of their size, which goes from the smallest angle to the largest angle. Therefore, the order of angles from least to greatest is indeed 23 (which we assume to be 23°, although not explicitly stated), followed by 38°, and then the largest angle being 80°. The other options do not represent a sequence of values in ascending order, as they include elements that cannot be compared directly (such as '2x', a variable expression) or are placed in a sequence that doesn't respect the least to greatest criterion.