What is the position of the testis in Periplaneta americana?

• A
  $7^{\text{th}}, 8^{\text{th}}, 9^{\text{th}}$ abdominal segments
• B
  $5^{\text{th}}, 6^{\text{th}}$ abdominal segments
• C
  $8^{\text{th}}, 9^{\text{th}}, 10^{\text{th}}$ abdominal segments
• D
  $4^{\text{th}}, 5^{\text{th}}, 6^{\text{th}}$ abdominal segments