Asset should be valued at the price paid to acquire them” is based on:

d. Cost concept 

Agree with the lady.

the answer is  d. Cost concept 

Its D

The Cost conept.

answer is D.  Cost concept 

Assets should be valued and be recorded it by the historical cost "  value paid "

historical cost value

Cost Concept (means asset is valued based on the price paid for acquisition of the asset)

D........

Cost Concept coz

An asset's initial book value is its actual cash value or its acquisition cost. Cash assets are recorded or "booked" at actual cash value. Assets such as buildings, land and equipment are valued based on their acquisition cost, which includes the actual cash cost of the asset plus certain costs tied to the purchase of the asset, such as broker fees. Not all purchased items are recorded as assets; incidental supplies are recorded as expenses. Some assets might be recorded as current expenses for tax purposes

D

Here the cost concept is the right choice