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Comprehensive and Detailed Explanation:

To find the amount of pure chemical, convert the percentage into decimal form and multiply by total volume.

3% = 0.03

Pure chemical = 0.03 × 500 = 15 liters

Therefore, the correct answer is C.

Percentage-based calculations are common in occupational safety, especially in chemical handling, industrial hygiene, and exposure assessment. Safety professionals frequently interpret concentrations in solutions, air contaminants, and material mixtures. Understanding how to convert percentages into usable quantities helps ensure safe handling, proper dilution, and compliance with exposure limits.

OHST professionals may also use these calculations when reviewing Safety Data Sheets (SDS), evaluating chemical storage, or verifying process safety requirements. Incorrect interpretation of concentrations can lead to improper use of chemicals, increasing the risk of exposure, chemical reactions, or environmental harm. Strong numerical skills support hazard communication, risk assessments, and operational safety decisions.