Which of the following is an indication that a tree may be dangerous to fell?

The presence of internal faults combined with a lean away from the direction of the intended fall is a significant indication that a tree may be dangerous to fell. Internal faults can include situations such as decay or structural weaknesses within the tree that may not be visible externally. When a tree is leaning away from the direction of the intended fall, it is more likely to twist or shift unpredictably during the felling process, increasing the risk of it falling in an unintended direction. This combination of factors heightens the potential for accidents, both for the individual felling the tree and for bystanders.

In contrast, the other options indicate either stability or do not necessarily signify an increased risk. For example, a tree with no visible defects on the trunk may appear strong and healthy, while a lean toward the intended fall direction could help guide the tree properly when it is cut. The presence of dead branches may indicate some level of health concern, but it does not inherently make the tree more dangerous to fell compared to the situation described in the correct answer.