Answer:
Alejandro´s opportunity cost is 2/3 of a chart.
Roger´s opportunity cost is 1/2 of a chart.
Explanation:
The cost of opportunity represent the benefits that you misses out on when choosing one alternative over another.  
In this case ,  we can say that Alejandro and Roger can produce 2 product.  And if they produce one ,  they loose the possibility of producing the other. 
We can Illustrate this situation with a production possibility frontiers graph and  if we increase  the quantity produced of one good,  will  decrease the other, because the limited resources.  
Alejandro produce 3 three pages of the paper in the same time it takes him to create two charts. We use cross multiplication to get  how many charts Alejandro produce at the same time he produce a single page
1___x
3___2 so x= 1x2/3
So ,  in the time he produce a single page of the essay,  he could produce 2/3 of a chart. This is the cost opportunity.
Roger can write two pages of the paper in the same time he can produce a single chart. So,  in the time he produce a single page of the essay he could make half of a chart.  
 
        
             
        
        
        
D) Business production is near full capacity and there is little unemployment.
        
             
        
        
        
Answer:
Option (a) is correct.
Explanation:
Given the marginal utility per dollar for the two products as follows:


All the individuals wants to maximize their utility that is obtained from the consumption of goods. We can see that marginal utility per dollar of product A is higher than the marginal utility per dollar of product B which means that this consumer should purchase more quantity of product A and less quantity of product B. 
It is going on until the point at which marginal utility per dollar of both the products becomes equal.
 
        
             
        
        
        
A automobile would be a asset