Question: The structural formula of the glycinium cation is shown above. Arrows indicate the $pK_a$ values for the labile protons in the molecule. Which of the following is true about the geometry of the glycinium cation? A) The leftmost C atom and all the atoms directly bonded to it lie in the same plane  B) Both C atoms and both O atoms lie in the same plane  C) The N-C-C bond angle is 180°  D) The geometry around the N atom is planar. Please choose an answer from [A, B, C, D].
Answer: B