Question: How much brighter than its main-sequence luminosity will a sun-like star become at the 2nd red giant phase of its life? Select one: A. Twice

How much brighter than its main-sequence luminosity will a sun-like star become at the 2nd red giant phase of its life? Select one: A. Twice as bright B. 2000 times brighter C. 50 times brighter D. 5000 times brighter

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