Parking in passing require coordination of many different driving skills combined with a continuous

The correct answer is thought process.

Parking and passing require coordination of many different driving skills combined with a continuous thought process.

Parking and passing need important driving skills such as to focus on the front and the mirrors to cover any spot and keeping hands in the proper position, combined with a very key element that is the thought process. When driving, we know is a serious business and the driver should not have any distractions. That is why the thought process is of the utmost importance. We need to know what to do and when to do it, depending on the situations.  

explanation:

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d) post-world war i