<span>concerto - a musical composition for a solo instrument
or instruments accompanied by an orchestra, especially one conceived on a
relatively large scale, opera - a genre of classical music, and sonata - a
musical composition of 3 or 4 movements of contrasting forms.
Hope this Helps!!
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Answer:
D. The boy worked hard on his story, for he wanted to win the contest.
Explanation:
A compound sentence is any sentence composed of two independent clauses, separated by a comma and a conjunction (for, and, nor, but, or, yet, so) or a semicolon. The two independent clauses in answer D are "The boy worked hard on his story" (subject being boy, verb being worked), and "he wanted to win the contest" (subject being he, verb being wanted). 
Answers A and B are incorrect because they do not contain two independent clauses.  C also does not contain two independent clauses, but instead a prepositional phrase, which could be confused with an independent clause. These are not the same however, and the comma separating this phrase and clause is not followed by a conjunction word, therefore it is not a compound sentence. 
I hope this helps! Happy learning, friend :)
 
        
             
        
        
        
Answer:
a. larger pipe diameters
Explanation:
This is the factor that allows pipelines to increase their capacity and move an increased amount of tonnage. When we increase the diameter of a pipe, this allows a larger volume of material (water, oil, etc.) to move through it. This means that we are able to move a larger volume (tonnage) of material in a shorter amount of time. This increases the efficiency of the pipelines in a very significant way.
 
        
             
        
        
        
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