Unfriendly or bad-tempered.
Since an infinitive phrase is a phrase that focuses on the object of the verb and an infinitive verb is an -ing verb, your phrase is "taking advanced math".
Meiosis is half the cells mitosis has, and meiosis is for sexual reproduction, and it also has diversity.
Explanation:
So like is that really the question?
That sentence would be (c) This diner is great because they always seat people quickly.
Who is they? They is typically used to refer to a group of people, however the only noun before it is the diner. While most automatically assume "they" refers to the servers, it is not explicitly stated in the sentence, which could be confusing.