Answer: Option D
Step-by-step explanation: Economic cost is the total cost a firm bears in the form of expenses incurred and opportunity cost incurred. Opportunity cost can be defined as the loss of profit for choosing one alternative over other.
In the given case salary and interest on certificate of deposit is the opportunity cost for Ellie.
so,
Economic cost = $80,000 + $15000 + $3000 + $1000 + $1200 + $35,000 + $500
= $135,700