Choose the correct option to change the following sentence into Direct Speech.

He commanded me to guard the door.

He said, "Guard the door."

The correct option is (1) "He said, 'Guard the door.""

In Direct Speech, when we report someone's command or instruction, we use the verb "say" or "said." In this case, "He said" is the reporting verb, and the command "Guard the door" is enclosed in quotation marks to indicate that it's the direct statement made by the person. This format accurately represents the transformation of the original sentence into Direct Speech. The other options do not follow the correct structure for reporting a command.