contestada

Which of these is an inappropriate shift in verb tense?
Lieutenant Diaz looked up from her pile.of paperwork. Something
strange was happening out in front of the base. Jumping from her
seat, she rushes out of her office to see what was going on. To her
surprise, the cadets were practicing formations on their day off.
A. rushes
B. were practicing
C. was happening
OD. looked