Refer to the labels (a) through (e) on the following sketch…
Refer to the labels (a) through (e) on the following sketch of an H–R diagram. [Note that choice (a) refers to the entire main sequence, while (c) and (d) refer to only small parts of the main sequence. If choices (c) or (d) offer better answers to the question than (a), use the best choice.] Which group represents stars fusing hydrogen in their cores?
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