Could you help me answer this question? Thank you You are learning the terminology of muscle microstructure and function

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Could you help me answer this question? Thank you

You are learning the terminology of muscle microstructure and function. Words like sarcolemma, sarcoplasm, sarcomere, myofibril, myosin, actin, A band, I band, Z-membrane, H-zone, M-line, T-tubule, etc. are no longer like a foreign language to you (hopefully)! Given your familiarity with this collage of terms, provide the basic function of the T-tubules.

A. They conduct the wave of depolarization from the muscle fiber membrane to the myofibril;

B. They release calcium ions into the sarcoplasm during depolarization of the muscle cell;

C. They release ATP into the cisternae of the sarcoplasmic reticulum;

D. They are primarily conduits for calcium ions;

E. They pump calcium ions back into the sarcoplasmic reticulum from the sarcoplasm.

Please explain why the answer is correct and why the remaining choices are incorrect