Nitration of aniline in a strong acidic medium gives a significant amount of $m$-nitroaniline because:

• A
  In electrophilic substitution reactions, the amino group is meta-directing.
• B
  In a strong acidic medium, aniline is present as the anilinium ion.
• C
  The $-NH_2$ group always directs to the meta position.
• D
  $m$-nitroaniline has a higher molar mass than $o$- and $p$-nitroanilines.