Pleasantly calm or peaceful; unruffled; tranquil; serenely quiet or <span>undisturbed i got this from dictionary.com</span>
<span>Scholaticism merges theology- specifically Christian theology- with Aristotelian logic. Theological truth guides Aristotelian inquiry in this particular methodology. One notable example is Thomas Aquinas. Yet the same can be said for the muslims, such as Averroes and Avicenna, who around the same general time, sought to apply Aristotelian logic within their own theological systems.</span>
The last one is grammatically correct
Yes, it is B, it is a defining relative clause, notice that without the relative clause the sentence feels empty <em>Only the players are going to get sunburned today. </em>
Defining relative clauses use <em>who/that</em> for people, <em>which/that</em> for things and they are not delimited by commas.
<em>Only the people that/who arrived first can enter.</em>
<em>This the house that/which I used to live in.</em>
Non-defining clauses are just extra comments, optionally they can be removed about the previous noun/pronoun, they are separed by commas and <em>that</em> cannot be used.
<em>Mary,who wears glasses, lives next door.</em>
<em>This country, which was a super power in the past, is still facing amajor economic crisis.</em>
