$x+i y=\left|\begin{array}{ccc} 6 i & -3 i & 1 \\ 4 & 3 i & -1 \\ 20 & 3 & i \end{array}\right|$ then what is $x$ - iy equal to?

• A

  $3+i$
• B

  $1+3 i$
• C

  $3 i$
• Correct answer
  D

  0

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