Plastic items carry a recycling code number from 1 to 7 stamped inside a triangle, and each number tells you what resin the plastic is made from and how safe it is to reuse or microwave.
Option 1 (code 1, PET): Used for bottles like water and soft drink bottles. It is meant for single use only and is not microwave safe.
Option 2 (code 5, PP): Correct. Code 5 is polypropylene, a plastic with a high melting point that stays stable under heat, so it is the one used for reusable, microwave safe containers like lunch boxes.
Option 3 (code 7, other/mixed): This is a catch all category for mixed or other plastics such as polycarbonate, and is generally not recommended for microwave use.
Option 4 (code 4, LDPE): Used for squeezable bottles and bags, and it is not rated for microwave heat either.
So the correct choice is option 2, since polypropylene (code 5) is the plastic that can safely handle microwave heat and repeated reuse.
