Respuesta :
Your answer is B!
A is used correctly because it's a continuation of the first thought, which is introducing you to the topic of the sentence. (the Thomas Fisher library in Toronto is the topic.)
C is used correctly because it provides a pause properly.
D is used correctly because it adds some separation (for clarity) in the two facts about the topic of the sentence. (The library tour guide is the topic.)
For B, it is used incorrectly because there's no need for that comma there. "The oldest scholarly library..." is fine without one.
A is used correctly because it's a continuation of the first thought, which is introducing you to the topic of the sentence. (the Thomas Fisher library in Toronto is the topic.)
C is used correctly because it provides a pause properly.
D is used correctly because it adds some separation (for clarity) in the two facts about the topic of the sentence. (The library tour guide is the topic.)
For B, it is used incorrectly because there's no need for that comma there. "The oldest scholarly library..." is fine without one.
B does not use a comma properly.
This is because "The oldest" and "scholarly library" are all adjectives (describing words), which do not need to be seperated.
This is because "The oldest" and "scholarly library" are all adjectives (describing words), which do not need to be seperated.