Which is the most risky type of contract for Muhammad?

A.  Cost Plus Percentage of  cost 

This is most risky type of contract for Muhammad. The contractor may uncessaruly increase the quantity and cost to get benefit form constructiion works and his fixed percentage over cost will also increase. So, this is very favoarable for contractor but very risky for Mr. Muhammad

thanks for invition ,,,,,,,,,, my choice is option A

(A) Cost + cost%

Reason: We can not control the cost of vendor services or product.

Cost Plus Percentage of cost is the most risky sir. 

My opinion is that the right answer is:

a

I think cost plus percentage of cost is risky type of contract

A) Cost plus percentage is the correct answer

Muhammad is buyer or vendor..?

it should be clear

TurnKey Lump-sum Contracts.

What Muhammad wants is not mentioned, assuming that Muhammad is trying to buy a product or service, Cost Plus Percentage of Cost is the most risky type of contract.