According to WHO, the number of key principles of food hygiene are—

Correct option is B

Option (a): Incorrect
• WHO identifies more than three principles for food hygiene.
Option (b): Correct
• WHO promotes Five Keys to Safer Food, which include:
– Keep clean
– Separate raw and cooked
– Cook thoroughly
– Keep food at safe temperatures
– Use safe water and raw materials
• These five form the foundation of global food hygiene education material.
Option (c): Incorrect
• Seven principles relate to HACCP, not WHO food hygiene keys.
Option (d): Incorrect
• WHO does not list nine key principles.