To model the situation described, we need to write a pair of linear equations based on the quantities of bags and caps, their costs, and the total items and budget constraints.
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Let \( b \) be the number of bags and \( c \) be the number of caps.
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They plan to give away a total of 2,000 items: \[ b + c = 2,000 \]
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The total cost for the bags and caps cannot exceed $12,500. Given that each bag costs $10 and each cap costs $5, the equation for the budget constraint is: \[ 10b + 5c = 12,500 \]
Thus, the pair of linear equations that model the situation is: \[ b + c = 2,000 \] \[ 10b + 5c = 12,500 \]
This corresponds to the option: b + c = 2,000; 10b + 5c = 12,500.