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A
To stay the course
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B
To turn aside or stray from a path
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C
To speed up
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D
To repeat
Why this is the answer
DEVIATE means to depart from an established course, standard, or norm; to turn aside or stray. Example: 'The pilot did not deviate from the assigned route.' The opposite would be to stay on course, offered as a distractor. The related noun is DEVIATION. The prefix DE- (away/from) plus the root 'via' (way/road) literally suggests moving away from the road. Recognizing the word parts — 'away from the way' — points directly to the meaning. DEVIATE is used for both physical paths and figurative departures from a plan or rule.
Source: ASVAB Word Knowledge — Synonyms