GMAT Critical Reasoning (CR) | Many houses that do not meet the building code will collapse

An easy "D"

Many houses that do not meet the building code will collapse in the next earthquake. To meet
the building code, houses must contain structural stabilizers sufficient to withstand an earthquake
of 6 or lesser magnitude on the Richterscale.Dora’s house meets the building code ,so
Dora’s house will survive the next earthquake.

In the argument above, the two portions in boldface play which of the following roles?

A. The first portion is a conclusion that must be true
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