Which of the following is NOT a factor that contributes to unsuccessful shots?

The statement that an animal being within effective range is NOT a factor that contributes to unsuccessful shots is accurate. Effective range refers to the distance within which a bowhunter can reliably and ethically take a shot at game due to their skill level, equipment, and the behavior of the animal. When an animal is within this effective range, it signifies that the hunter has the potential for a successful shot, provided other factors are managed well.

In contrast, shooting at an animal that is alarmed often leads to unsuccessful shots due to the animal's unpredictable movements. Poor light conditions can also hinder the hunter's ability to aim accurately, as visibility plays a crucial role in spotting and targeting game. Moreover, a lack of practice with hunting equipment can greatly affect a hunter's shooting precision and confidence, ultimately compromising the success of the shot even if the animal is within range. Therefore, while the other options present valid concerns that can lead to unsuccessful shots, being within effective range is fundamentally a positive condition for a hunter aiming to make a successful shot.