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This part of the felling process is critical in controlling the direction of fall:

  1. Crosscut

  2. Limbing

  3. Notch

  4. Scribing

The correct answer is: Notch

The notch is a V-shaped cut made in the tree trunk and is essential in directing the fall of the tree. The other options, such as crosscut, limbing, and scribing, are important steps in the felling process but do not specifically control the direction of fall. Crosscut refers to cutting across the grain of the wood, while limbing is the process of removing the branches from the tree trunk. Scribing is the act of marking the tree for cutting but does not directly affect the direction of fall. Therefore, C is the only answer that accurately describes a crucial step in controlling the direction of fall during the felling process.