Immunity here means if we make certain changes in the one level of database design it will not affect the other part of database design.
Physical data independence:- if we make any change in the physical storage of schema that it will not affect our logical schema/ conceptual schema like relation table.
Logical data independence:- if we make any change in the conceptual schema it will not affect external schema or end software using this database.
SO answer B.
https://www.tutorialspoint.com/dbms/dbms_data_independence.htm