Questions: How old must an individual be to donate blood at a blood bank? 18 19 21 17

The answer is the last one (or D): 17.

Explanation for each option:

• 18: This is incorrect. While some countries or organizations may have different age requirements, the minimum age to donate blood in the United States is generally 17.
• 19: This is incorrect. The minimum age requirement is lower than 19.
• 21: This is incorrect. The minimum age requirement is lower than 21.
• 17: This is correct. In the United States, individuals must be at least 17 years old to donate blood at a blood bank, although some states allow 16-year-olds to donate with parental consent.

Summary: The minimum age requirement to donate blood at a blood bank is generally 17 years old.