Darling Dollhouses sells unassembled dollhouses, but it is contemplating selling assembled dollhouses instead. Currently, the firm charges $120 for each unassembled house it sells. Darling estimates the fixed production costs for assembling one dollhouse will be $9 and the variable costs will be $5. Based on these figures,

A : Darling should only switch to producing assembled dollhouses if it anticipates selling them for more than $134.

B : Darling should only switch to producing assembled dollhouses if it anticipates selling them for more than $120.

C : we cannot determine how much Darling should charge for the assembled dollhouses in order to make them the more profitable option.

D : Darling should only switch to producing assembled dollhouses if it anticipates selling them for more than $129.