The opportunity cost in this scenario is Mikael's decision to forgo seeing Ouro Preto during his stay in Brazil.
Opportunity cost refers to the decision making process people use in terms of how they spend their time, resources, or money. This term refers to the loss that a person suffers by picking a certain option. In this case, Mikael does not want to cut his food budget. Instead, he picks to skip visiting Ouro Preto. So this represents how Mikael is losing out on seeing this site in order to eat the foods he wants while on vacation.
The conjugation of the verb "design" to "designed", without any auxiliary verb such as "have" or "do", shows the use of the 'simple past" tense (also known as preterite), whose principal function is to place a completed action or situation in a moment before "now".
What tense is the underlined verb in the sentence? The architect designed a daring structure.
D. Past
