$\left(\frac{1+i}{1-i}\right)^{228}=$

• A

  $-4\left(\frac{1-i}{1+i}\right)^{226}$
• B

  $4\left(\frac{1-i}{1+i}\right)^{226}$
• Correct answer
  C

  $\left(\frac{1-i}{1+i}\right)^{228}$
• D

  $-\left(\frac{1-i}{1+i}\right)^{228}$

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