Bringing the Ford Motor Company back from the verge of bankruptcy shortly after the Second World War was a special governmentally sanctioned price increase during a period of wage and price controls.
(A)
Bringing the Ford Motor Company back from the verge of bankruptcy shortly after the Second World War was a special governmentally sanctioned price increase during a period of wage and price controls. -
No referent/subject for the Dependent Clause [Bringing...].
(B) What brought the Ford Motor Company back from the verge of bankruptcy shortly after the Second World War was a special price increase that the government sanctioned during a period of wage and price controls. -
The most concise and grammatically correct choice. (C)
That which brought the ford Motor Company back from the verge of bankruptcy shortly after the Second World War was a special governmentally sanctioned price increase during a period of wage and price controls. -
"That which" is weird and redundant, and I would suspect that two back-to-back relative pronouns is a modifier error. (D)
What has brought the Ford Motor Company back from the verge of bankruptcy shortly after the Second World War was a special price increase that the government sanctioned during a period of wages and price controls. -
Verb Tense error: simple past tense is used for general facts and definitions. The price increase had one effect, not a continual effect since WWII, i.e., it is not coming back perpetually.
Parallelism: wages and price in comparison to wage and price(E) To bring the Ford Motor Company back from the verge of bankruptcy shortly after the Second World War,
there was a special price increase during a period of wages and price controls that government sanctioned. -
Pronoun Error: There has no antecedent, as there has to refer to a location or a location within a prepositional phrase. Same parallelism error as D.