Add the missing commas.

Rice which is the basic food for millions does not lend itself readily to mass-production
methods.

1. Rice which is the basic food for millions, does not lend itself readily to mass-production methods.

2. Rice, which is the basic food for millions, does not lend itself readily to mass-production methods.

3. Rice, which is the basic food for millions does not lend itself readily, to mass-production methods.
No commas needed.