A piece of evidence as seen in this passage is:
<h3>What is evidence?</h3>
Evidence is referred to something/statement which actually proves a point or fact. Evidence helps one to understand the subject matter as a result of what has proven it valid.
From the question, we can clearly see that an author was quoted in options A and D. These options actually present an evidence.
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I’m gonna take a guess learning disability
I’m pretty sure it is C. Explicit. I could be wrong but Explicit means saying something directly, it is not implied.
Answer:
transportation systems improved
Explanation: