How can the existing environment variable FOOBAR be suppressed for the execution of the script./myscript only?

How can the existing environment variable FOOBAR be suppressed for the execution of the script./myscript only?
A . unset -v FOOBAR;./myscript
B . set -a FOOBAR="";./myscript
C . env -u FOOBA
D . /myscript
E . env -i FOOBA
F . /myscript

View Answer

Answer: C