GMAT Critical Reasoning (CR) | Re: If the check valves in nuclear power plants do not function properly,

Premise :- If the check valves in nuclear power plants do not function properly, other parts of the plants’ piping systems can be critically damaged. Check valves cannot be tested in actual operation, but they are disassembled as part of routine annual maintenance and any flawed parts are replaced.
Conclusion:- Therefore, power plant accidents attributable to malfunctioning check valves are unlikely to occur.
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We are asked to weaken the conclusion using 1 of the 5 true statements.

(A) Approximately
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