One weakness of the cost approach for appraising market value is that: a. builders may not pay market value for materials or labor.
b. market value is not always the same as what the property cost.
c. comparables used may not have similar quality of construction.
d. new properties have inestimable costs and rates of depreciation.

b. market value is not always the same as what the property cost.

Explanation: In the process of property valuation in real estate, potential users or buyers have to appraise a property before they make offers, this will enable them know the value and the reasonable price to offer. One of such method of appraisal is the cost approach which is based on the basis that, a property shouldnt be purchased by a buyer at a price beyond the cost of erecting an equivalent structure. Of the options listed above, using the notion of not paying beyond the cost of erecting a similar building could be considered a weakness in f the approach in situations whereby the market value of the property is not the same as the value of the property. The market value of a property could be influenced by different factors including seasonality, changes in geography or terrain and so many other factors which may influence the value of an asset which might not affect the real cost of the property. Hence, the discrepancy.

you have to put the parentheses like this:

in fact, you have to perform the operation inside parentheses first, and then proceed in order:

they work in some type of way