In the flowers of $Solanum$,the carpels are placed obliquely. This is because:

• A
  The posterior and anterior carpels are rotated by $180^o$.
• B
  The posterior and anterior carpels shift to the left side.
• C
  The posterior carpel shows a tilt to the right and the anterior carpel shows a tilt to the left.
• D
  The posterior carpel is tilted to the left and the anterior carpel is tilted to the right.