Option A is best B distorts the meaning
Just a question towards the end of the sentence...
hot sauces stimulate the release of endorphins in the brain, just as exercise does, and these have a pain-relieving effect like morphine's ( morphine's pain relieving effect is implied)
Just a question towards the end of the sentence...
hot sauces stimulate the release of endorphins in the brain, just as exercise does, and these have a pain-relieving effect like morphine's ( morphine's pain relieving effect is implied)