A. <span>Christine ran slower than her sister. 
<em>Slower </em> is comparing Christine's speed to the speed of her sister.
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B is a fact because it's just one point, whereas A, C & D are a point with an explanation- more likely a persons opinion. 
Hope this helps!!
        
             
        
        
        
A. How many people will be coming to the party next week?
B. Which team won first prize last weekend?
C. What happened this morning when you were late for work? 
D. Who told you the answer to the exam question?
E. Who lives next door to you ? 
F. What is the right answer to this question? 
G. Whose car is the red one over there? 
H. How many students came to your English class?
        
             
        
        
        
Answer:
True
Explanation:
The question is basically asking: "True or false: Pre-Columbian art and culture was produced in the Americas before the arrival of Christopher Columbus".
This statement is true. As can be seen from the name of this art movement / art type, it's called "Pre-Columbian". "Pre" means before, so essentially, the name says that the art and culture is "before Columbus", making the statement correct.
Hope this helps!