Heat sterilization of foods before filling into pre-sterilized containers is called:

Correct option is C

Aseptic processing involves:
Sterilizing the food product through heat (usually above 135°C),
Sterilizing the containers separately,
Filling and sealing the food into the containers in a sterile environment.
It is widely used for shelf-stable products like UHT milk, juices, soups, and sauces, where prolonged shelf life without refrigeration is desired.
Explanation of other options:
Blanching: Mild heat treatment, not sterilization; used to inactivate enzymes in vegetables.
Commercial sterilization: General term for reducing microbial load, but usually refers to sterilizing food after packaging (e.g., in canning).
Canning: Food is sealed in containers and then heat-sterilized, unlike aseptic where heating is done before filling.
Hence, the correct answer is Option (c).