Salamanders can regrow entire limbs and regenerate parts of major organs, an ability that relies on their immune systems, research now shows. ... They then wiped out some or all of the macrophage cells to determine whether these cells were essential for regrowing the limbs.
I believe B. Specific to a certain subject and C. requires knowledge of denotative meaning. Hope this helps
"A" sounds the best and is for sure the correct answer!
Answer:
A.
Explanation:
B, needs another punctuation,
C, grammar mistake
D, needs capitalization
