The relative pronoun 'who' refers to 'people' which is a subject of this sentence, so the correct answer is C, this is also a subject.
the answer is A they were originally horizontal
<span>"Chance" can signify an opportunity (i.e. the chance to prove yourself), or it could refer to luck (i.e. It was by chance that he won). "To lead" means to be in charge (i.e. Since she has great communication skills, she can lead the group). "Before" means previously or prior (i.e. I need to study before taking the test). "To get to" means to reach (i.e. We can take a break once we get to the mountain). "To enjoy" means to be pleased by something (i.e. I always enjoy a piece of chocolate cake after a long day). "Cuisine" refers to cooking or meals (My mom's cuisine rivals that of any top chef). "Leaving" can mean to go away (i.e. I'm leaving in five minutes) or to allow something to stay (i.e. I'm leaving the keys on the table). "To buy in advance" means to purchase something before you need it, in anticipation of needing it (i.e. I don't need the books for another two weeks, but I bought them in advance to make sure I have them). </span>
