Concept:The correct word must mean "to turn away from a set plan" and must fit grammatically with the preposition "from".
Explanation:The phrase "vicissitudes of life" refers to the ups and downs or difficulties that a person faces.
The sentence states that in spite of those challenges, she never left her plan or moved away from it.
The verb "deviate" means to stray or depart from a set course, standard, or plan, and it is correctly used with "from".
So, "she never deviated from her plan" is the most accurate completion.
Now let us look at the other options.
"Evaded" means to escape or avoid something, and it is not normally followed by "from".
"Detracted" means to reduce the worth or value of something, which does not suit the meaning of the sentence.
"Detoured" means to take a longer or roundabout route, which is not appropriate for a plan.
Therefore, the best choice is "deviated".
Answer:C. deviated