The sarcoplasmic reticulum stores a)acetylcholine, which triggers muscle contraction b)calcium, which triggers muscle contractionsc)tropomyosin, which prevents myosin from detaching from actin

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True it's the strategy

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Bmust be the answer, as technically all organs move, so a is incorrect. all organs are made of different types of cells, so that isn’t a problem, so c is also incorrect. human hearts are very similar to many other animals’ hearts, so d is also incorrect, yet the heart is made of muscle, which is hard to grow in the lab so it would be correct to say b