Reduces carbon monoxide emissions from gasoline and improves fuel octane
        
             
        
        
        
Both A and B are correct. 
        
             
        
        
        
B.) Adenine because Dictated by specific hydrogen bonding patterns, Watson-Crick base pairs (guanine-cytosine and adenine-thymine) allow the DNA helix to maintain a regular helical structure that is subtly dependent on its nucleotide sequence.
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Answer:
It’s important to avoid extra costs, time and wrong knowledge/ idea.
Explanation:
I think the source of information related to job are important for the concerned people in order to enable them have the best view and position on jobs available. This helps them to weigh their options very well before taking decisive actions.
It also helps to avoid extra costs, time and wrong knowledge/ idea which in turn promotes general efficiency of such group of people.