Final answer:
If a pry bar is not available, the safest tool to use as an alternative is a crowbar, which also functions as a lever. Power drills and socket wrenches are not suitable substitutes for this task.option D.
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Step-by-step explanation:
If a pry bar is not available and the task at hand involves prying or levering, the safest alternative tool that can be used is a crowbar. Like a pry bar, a crowbar is a type of lever and fits the definition shown in Figure 9.7(a) where a pry bar is described: a lever where the ideal mechanical advantage equals the length of the effort arm divided by the length of the resistance arm. While an adjustable wrench, hammer, or screwdriver may sometimes be used in impromptu situations to pry items, they are not designed for this use and may not safely sustain the force required, leading to potential injury or tool damage.
It should be noted that neither power drills nor socket wrenches are appropriate substitutes for a pry bar as their functions and applications are quite different. Power tools and socket wrenches are primarily used for drilling or tightening and loosening bolts and nuts respectively, not for prying or levering objects.