Stars are defined to be on the main sequence if they are burning hydrogen in their cores (hydrogen is combining into helium through nuclear fusion). eventually, a star will run out of hydrogen fuel in its core, nuclear fusion will stop, and the star will enter a new stage of its lifetime. examine the table here, and use what you learn from it to choose the correct statement. choose one: a. more massive stars emit less energy and run out of hydrogen fuel in their cores faster. b. more massive stars emit more energy and run out of hydrogen fuel in their cores more slowly. c. more massive stars emit less energy and run out of hydrogen fuel in their cores more slowly. d. more massive stars emit more energy and run out of hydrogen fuel in their cores faster.