(A) to twice the normal value increasingthe modifier that starts with 'increasing' needs to be separated with a comma as done in other options.
Incorrect.(B) to two times more than the normal value, thereby increasingAwkwardly phrased. more than two times the normal value or twice the normal value would make more sense.
Incorrect.(C) by twice the normal value, thereby increasingAmbiguous. If read literally, the sentence sounds like sharp turns and skids increase the pressure by using "twice the normal value" as a way to increase it. Option E is better.
Incorrect.(D) to twice the normal value, which increasesThe modifier beginning with 'which' modifies the noun 'value'. This distorts the intended meaning because value is not degrading the process, rather the degradation is happening because of the increased pressure by sharp turns and skids.
Incorrect.(E) to twice the normal value, thereby increasingpressure is a quantity. So sharp turns and skids increasing the pressure to twice the normal value makes perfect sense.
Correct.