Answer:  D) Monopolistic competition       
Explanation: Monopolist competition is the competition in the marketing field by selling the products which are different from each other on basis of certain parameters such as brand. 
According to the situation mentioned in the question ,presence of 12 airlines for opting are huge amount where airplane is viewed from product point of view and thus, it will create a imperfect competition.
Other options are incorrect because perfect competition is raised by the perfect market of products, monopoly is the situation with no competition and oligopoly is the competition with limited number of seller and their products.Thus, the correct option is option (D).
 
        
             
        
        
        
There isn't one  but if i had to choose one it would only be if it was an emergency 
        
             
        
        
        
The New Jersey Plan was one option as to how the United States would be governed. The Plan called for each state to have one vote in Congress instead of the number of votes being based on population. It was introduced to the Constitutional Convention by William Paterson, a New Jersey delegate, on June 15, 1787.
 
        
             
        
        
        
He argued that most important aspect of adolescence is maturity.
Adolescence is the bridge that connects childhood into adults that are capable in handling their own problems.
He describes maturity as a state of developing awareness separate which need to be done and which need to be ignored to achieve our goal.