Which statement is true regarding the adequacy of consideration?

a$)$

Courts consider the adequacy of consideration only if something is sold for less than $90\%$ of its market value.

b$)$

Courts consider the adequacy of consideration only if something is sold for less than $70\%$ of its market value.

c$)$

Courts generally consider the adequacy of consideration in determining whether to enforce a contract and ignore whether not consideration was actually exchanged.

d$)$

Courts consider the adequacy of consideration only if something is sold for less than $80\%$ of its market value.

e$)$

Courts seldom consider the adequacy of consideration. Rather, the court is more concerned whether or not an exchange of consideration actually occurred.