Unquoted equity instruments - FRA

Hi,

The book states that the following for Unquoted Equity instruments: “Unquoted equity instruments (in limited circumstances where the fair value is not reliably measurable, cost may serve as a proxy (estimate) for fair value)”

What does this “cost” means? I selected Amortized cost in the following question and it was wrong.

XYZ Corp. is a specialist trading firm that invests in thinly traded Japanese unquoted equity .The firm policy is to never hold more than 5% of the stock. According to US GAAP, the most likely balance sheet measurement base for the equity is:

a. cost. (right answer)

b. amortized cost.

c. fair value.

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Equity securities can never be held at amortized cost. The exhibit says cost or amortized cost.