The effort needed to pull a stopper from a bottle's neck varies between 300 and 500 N. Determine the range of forces F needed to uncork a bottle using the lever-based opener.

• A. 10.5 N to 11.3 N
• B. 20.7 N to 21.5 N
• C. 34.3 N to 57.1 N
• D. 40.7 N to 62.5 N

Answer: (C)