Out of the following answers, option A. seems most fitting. Elderly customers would likely want a calm environment where they can work at their own pace. The other options cater to other demographics. So A. would be an appropriate emphasis for Charles' message.
 
        
                    
             
        
        
        
By earning higher levels of education, students learn skills and are more likely to be employed. In their jobs, they use their skills to provide goods and services to others. The economic concept which is applied in this statement is a positive externality.
<h3>What are skills? </h3>
Skills refer a set of qualities or abilities an individual carries in order to complete the task. These skills represent the expertise of any individual in terms of knowledge and talents.
When these skills are learned along with the higher level of education it creates an add-on for the career. These skills include communication skills, problem-solving skills, critical thinking, leadership qualities, and so on.
Therefore, option E positive externality is the correct option for the given statement.
Learn more about education, here:
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Answer:
a. $28
b. $19
c. 800 watches
Explanation:
The equation is 
p = D(q) = 28 - 2.25
The equation of the demand would be
P = 28 - 2.25q
a. The price would be
= $28 - 2.25 × 0
= $28 - 0
= $28
b. The price would be
= $28 - 2.25 × 4
= $28 - 9
= $19
The quantity demanded is come in hundreds so we take only 4 
c. The quantity woul dbe
$10 = $28 - 2.25q
$10 - $28 = -$2.25q
-$18 = -$2.25q
So q would be
= 800 watches