My guess would be d. previously, because it's talking about early cars.
Certain processes, models, questions, and ideas are applied by the reader, resulting in improved clarity and comprehension. When a reader "skims" a text, the reader just sees the surface qualities and information.
Answer:
sorry but i cant be able to see the question
<span>D. They are written in the format of a business letter.</span>
How about:
Website...
Program...
Foundation...
Base...
Network...
Database...
System...
