Respuesta :
Answer:
D- Revise her research question to be broader.
Explanation:
See attachment :)
The adjustment Mackenzie can make to improve her research plan is, Revise her research question to be broader.
What is broader?
Broader means to have broad ranging scope of subject.
Because she is searching for information on the effects of self-driving vehicles on people who live in rural areas, where there is very less people who would be interested in self-driving vehicles as rural areas people are mostly into agriculture and live close to one another so they don't required such vehicles. Thus is should include the urban areas to broader.
Hence the correct option is, Revise her research question to be broader.
To know more about broader:
https://brainly.com/question/25250701
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