A 2-year old male castrated mixed breed dog presents for an altered gait after being hit by a car. On physical exam, the thoracic limbs had decreased biceps and triceps reflexes and decreased muscle tone. The pelvic limbs had hyper-reflexive patellar and gastrocnemius reflexes and increased muscle tone. Where is the spinal cord lesion?
一只2岁已绝育的雄性混种犬在被车撞后出现了步态改变。体格检查时，前肢二头肌和三头肌出现反射和肌张力降低。后肢髌骨和腓肠肌反射过强，肌张力升高。脊髓受伤部位在哪里？
A. C1-C5
B. L4-S3
C. C6-T2
D. T3-L3