Load - a heavy or bulky thing that is being carried or is about to be carried/fill (a vehicle, ship, container, etc.) with a large amount of something.
Allow - let (someone) have or do something.
Aloud - in a voice loud enough to be heard
Allowed - let (someone) have or do something.
Among the given options, only 'aloud' fits in the blank contextually and gives the meaning that Vishal is going to read the story in a voice loud enough to be heard.
The correct sentence is: Vishal is going to read the story aloud.
Hence, option (c) is the answer.