The figures below depict two situations in which two infinitely long static line charges of constant positive line charge density $\mathrm{\lambda }$ are kept parallel to each other. In their resulting electric field, point charges $\mathrm{q}$ and $-\mathrm{q}$ are kept in equilibrium between them. The point charges are confined to move in the $\mathrm{x}$ direction only. If they are given a small displacement about their equilibrium positions, then the correct statements(s) is (are)

• A

  Both charges execute simple harmonic motion
• B

  Both charges will continue moving in the direction of their displacement
• Correct answer
  C

  Charges $+\mathrm{q}$ executes simple harmonic motion while charges $-\mathrm{q}$ continues moving in the direction of its displacement
• D

  Charge $-\mathrm{q}$ executes simple harmonic motion while charges $+\mathrm{q}$ continues moving in the direction of its displacement

Hence, the correct answer is option: 'C'.