The length of the sides of the triangle can be arranged in order from shortest to longest is MN < NO < MO and this can be determined by using the properties of a triangle.
Given :
In ΔMNO m∠O < m∠M < m∠N.
The following steps can be used in order to determine the list of the side lengths in order from shortest to longest:
Step 1 - The properties of a triangle are used in order to determine the list of the side lengths in order from shortest to longest.
Step 2 - According to the given data, in ΔMNO m∠O < m∠M < m∠N.
Step 3 - So, the length of the sides of the triangle can be arranged as:
MN < NO < MO
Therefore, the correct option is A).
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