On What Grounds Does Mill Argue That It Is Wrong

On what grounds does Mill argue that it is wrong to suppress freedom of opinion?

A) The opinion that is sought to be silenced may turn out to be true
B) Even if that opinion is false, it may contain elements of truth worthy of discussion.
C) If the prevailing opinion is not allowed to be earnestly contested, that prevailing opinion will be based not on reason but on prejudice.
D) All of the above