Discussion
When would a weaker line be chosen deliberately?
Answer: B
A less sensitive line extends the working range upward, so a concentrated sample can be read directly instead of being diluted. It worsens rather than improves the detection limit, does not remove the need for correction, and lamp current is unaffected. Deliberately giving up sensitivity to gain range is a trade worth making when dilution would introduce more error than the weaker line does. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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