A cover letter is the professional communication .
        
             
        
        
        
Answer:
C) budget constraint
Explanation:
The budget constraint is a graph of all the combinations of goods and services a consumer can purchase given prices and income of the consumer. 
The absolute slope of the budget constraint is the relative price of the two goods represented on the graph.
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A list of accounts and balances before adjustments are recorded is known as a(n) Unadjusted trial balance.
What is accounts?
The entry of a transaction in a financial statement is referred to as a “accounts.” The account has been updated to reflect the debit and credit transactions. Assets, liabilities, revenue, equity, and expenses are all types of financial activity.
The unadjusted before trial balance as the adjustment of the record in the accounts. The trial balance as the entry in the double-entry account book, as the indicating the errors of the accounting. 
As a result, the unadjusted trial balance, list of accounts and balances before adjustments are recorded. 
Learn more about accounts, here:
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Answer 
D. A sunk cost is any cost that was expended in the past but can be recovered if the firm decides not to go forward with the project.
Explanation:
As per the data given in the question,
Option (D) is correct among the given statements. A sunk cost is that cost which was occurred and expended in the past and if firm decides to do not go ahead, it can not be recovered.
For illustration - Think about the cost incurred to find out the feasibility of the project. Though in past firm was agree with the project but now even if the firm decides not to the project, this cost can not be recovered.
 
        
             
        
        
        
Answer:
A monopolist that practices perfect price discrimination
- a. creates no deadweight loss. 
Explanation:
Theoretically, if a monopolist is able to practice perfect price discrimination:
- marginal revenue curve = demand curve
- consumer surplus = 0
- every customer pays the highest amount that they are willing to pay
- production level = perfectly competitive level of output