The robber took to his heels when the police arrived. A. opened fire B. hid himself C. ran off D. surrendered

opened fire
hid himself
ran off
surrendered

The correct answer is C. ran off.

To “take to one’s heels” means to run away quickly. This is the most likely action for a robber to take when the police arrive, as they will be trying to avoid capture.

The other options are not as likely. A robber is unlikely to open fire on the police, as this would only increase their chances of being caught. They are also unlikely to hide themselves, as this would make it difficult for them to escape. Finally, they are unlikely to surrender, as this would mean giving up and facing the consequences of their actions.

In conclusion, the correct answer is C. ran off. This is the most likely action for a robber to take when the police arrive.