What is the first line of defense against a deadly collision?

a. the ability to signal and change lanes properly
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b. the ability to pay attention
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c. good knowledge of the area
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d. both a and c

"The ability to pay attention" is the one among the following choices given in the question that is the first line of defense against a deadly collision. The correct option among all the options that are given in the question is the first option or option "A". I hope that this is the answer that has come to your desired help.

The answer is biodiversity resulting from new ancestors.