To execute a Datastage job from the command line prompt, you can use the "dsjob" command with the "-run" option.
The correct answer is C) dsjob -run.
Here is an explanation of each option:
A) dsjob run - This option is incorrect because the correct syntax is "dsjob -run".
B) dsjobrun - This option is incorrect because it does not follow the correct syntax. The correct syntax is "dsjob -run".
C) dsjob -run - This option is correct. The "-run" option is used to execute a Datastage job from the command line prompt.
D) run jobname - This option is incorrect because it does not follow the correct syntax. The correct syntax is "dsjob -run".
Therefore, the correct answer is C) dsjob -run.