Final answer:
The best revision of the sentence in question is 'C. The governor signs or vetoes bills,' as it clearly and concisely conveys the governor's role in the legislative process. Governors have various veto powers including the line-item veto and the amendatory veto, which provide them substantial influence over legislation.
Step-by-step explanation:
The correct revision of the sentence 'It is the governor who signs or vetoes bills.' is 'C. The governor signs or vetoes bills.' This option is the most direct and concise way of stating what the governor does with bills that have passed through the legislative process. Governors have a significant role in the lawmaking process, which includes the ability to veto legislation or portions thereof, such as with a line-item veto. It is important to recognize the checks and balances that exist within the state governmental system where a governor's veto can be overridden by a legislative supermajority.
Governors possess various veto powers which serve as a check on the legislative branch. These can range from the full veto of a bill, the line-item veto, amendatory veto, and in some cases, the reduction veto. The flexibility provided by these different veto powers can influence legislation and policy outcomes significantly. The 'Frankenstein' veto, which allows a governor to string together portions of text from a bill to change its intent, and the 'Vanna White' veto, where specific letters can be vetoed to alter the meaning of sentences, has been controversial and faced restrictions in places like Wisconsin.