A. Darrel ran his schoolmate in the mall into.
B. Darrel ran his schoolmate into in the mall.
C. Darrel ran into his schoolmate in the mall.
Feedback When we use phrasal verbs we should remember that some of them are separable while others cannot be separated. 'to run into' belongs to inseparable phrasal verbs.
D. Darrel into ran his schoolmate in the mall.