The output from a dot matrix printer has become lighter over time.

Comprehensive and Detailed In-Depth Explanation:

Dot matrix printers use an inked ribbon that physically contacts the paper through tiny pins. Over time, the ribbon wears out or dries up, resulting in faded or light print output. Replacing the ribbon restores print quality.

Option A: Cleaning helps with image clarity, not ink density.

Option C: Maintenance kits apply to laser printers, not dot matrix.

Option D: Calibration affects print position, not darkness.

CompTIA A+ Core 1 Exam Objective Reference:

Objective 3.7: Given a scenario, troubleshoot common printer problems.

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