If $5 \sin \theta+3 \cos \left(\theta+\frac{\pi}{3}\right)+3$ lies between $\alpha$ and $\beta$ (including $\alpha, \beta$ also), then $(\alpha-\beta)(\alpha+\beta-6)=$

• A

  $28-5 \sqrt{3}$
• Correct answer
  B

  $0$
• C

  $3$
• D

  $28+5 \sqrt{3}$

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