When is a secondary source more than a primary source?
a: when you are an expert in the field being studied in the experiment
b: when you do not need many details about the experiment
c: when you want to know the exact data values
d: when you do not need to know the conclusion of the experiment

B: When you do not need many details about the experiment

Explanation:

Primary Sources are the first-hand accounts of the topic.

Secondary sources are the scholarly books or articles.

The secondary source interprets and also analyzes the primary sources.

Thus, secondary data can be used as a precursor for publishing new primary data.

Thus, Option B: When you do not need many details about the experiment is correct.

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your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.