Can anyone solve this?

Okay, there are 4 people captured by a terrorist. 2 of them have a white hat, and the other 2 has black.
They are dug down, they are only allowed to look forward, and they are not allowed to speak to eachother.
Only 1 is allowed to guess his color, if he guesses incorrectly everyone dies. if he guesses right the terrorist sets everyone free.
There is a wall between A and the rest.
Only one of A,B,C,D are capable of figuring out his color.
Pro tip here would be to think 1 step at a time and imagine the scenario for yourself. Good luck
Screenshot - 4f46796930c1f350d5342383eec68274 - Gyazo

^
On phone atm, check image above.
Goes as following from left to right: A,B,C,D. You have 1 week to solve this before I reveal the answer.

 

no