I chose B, although C was close bet. I used negation and thought if there are some reasons that the leak prevention technology would be ineffective, the argument falls apart. Pls explain what you think.
PS - Looks like a different version of this CR question is already posted, but there is not much of explanation in there.
PS - Looks like a different version of this CR question is already posted, but there is not much of explanation in there.
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