When trying to evaluate whether a dog is showing strong aggression as opposed to strong fear, one can readily see the difference in the
a. wetness or dryness of the nose.
b. eyes staring or looking away.
c. ears pulled forward or pinned back.
d. tail wagging or loosely relaxed behind the body.

The correct option is C.
When a dog is afraid, its ears are usually pinned back to the head. A dog showing aggression will pulled its ear up and forward.
Other signs that a dog shows when it is afraid include: lowering of the head, wrinkling of the nose, curled lips that show many teeth, tucked tail, panting, etc.
Signs show by an aggressive dog include: head held high, curled lips only show the front teeth, tail is upright and stiff, no panting, etc.

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