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

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