What type of evidence are articles, books, encyclopedias, and reliable websites? A. Scientific research
B. Results
C. Observations
D. Conclusions

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The correct option is A

Explanation:

This question seeks to describe how evidence are drawn from the "sources" mentioned (articles, books, encyclopedias and reliable websites). Evidence are drawn from these sources based on scientific research which usually include the following component; observations, experiment, results and conclusions (most of which are also part of the options provided). The evidence from these sources are thorough and involves several procedures which is the reason it can neither be observations only nor results only or even conclusions only but must be a combination of these three component which is actually a part of scientific research.

a cause it makes more sense

the correct answer is:

a. formation of precipitation

i believe the answer is true.