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A product team is redesigning an expense-report form. Their research shows that users must remember the correct cost-center code for each expense line, look it up in a separate document, and re-enter it on the form. Applying the principle of reducing extraneous cognitive load, which design change best addresses the root cause?

1. AAdd a tooltip that explains what a cost-center code is.
2. BProvide a searchable drop-down that lists cost-center codes with their descriptions, so users select instead of recall.
3. CAdd a help page that lists all cost-center codes in a single table.
4. DIncrease the font size and contrast of the cost-center field label.