Answer: Option (B) is correct.
Explanation:
If true, the following will most seriously weakens the argument: There has been an increasing rate in store opening in the central shopping district (CSD) since Colson's have opened discount stores.
Since after Colson's opened, the locations which were vacant became stores in particular discount store which did not spar with Colson's. Now that we have a discount store & department store without discount. Therefore when these stores close while competing with SpendLess, they wont be replaced with regular non-discount stores .