B. I think I'm not so sure but that's my best guess.
<span>Cardiovascular / Circulatory system: ...Digestive system / Excretory system: ...Endocrine system: ...Integumentary system/ Exocrine system: ...Lymphatic system / Immune system: ...Muscular system/Skeletal system: ...Nervous system: ...<span>Renal system / Urinary system:</span></span>
Try using this website to answer your question
https://www.wiley.com/college/boyer/0470003790/structure/tRNA/trna_text.htm
Explanation: C.) DNA polymerase