I personally would say A. Since it grabs your attention and you think it may be heading elsewhere so you want to read it.
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.
<span>They are not comforted by his words, and they remain together.</span>
A would be the correct answer
Since nothing is underlined i presume that the underlined pronoun is them. It is in the dative case because them is an object and answers the question to whom was something done. Them refers to the trainer's team.