Select the word which means the same as the group of words given.That which cannot be taken by force

Select the word which means the same as the group of words given.That

1.	Select the word which means the same as the group of words given.That which cannot be taken by force
A.	immutable
B.	inapprehensible
C.	impregnable
D.	inaccessible
Answer» D. inaccessible