>>72315There's not enough information to name (b) as fir. It could be douglas-fir, spruce, fir, hemlock, or baldcypress. Likewise, an outline of a Christmas tree is no positive identification of a fir tree. OP's image is even worse, since it just uses archetypal leaf types, as you might see in the beginning of a plant field guide to simply illustrate things like simple vs. compound, palmate vs. pinnate, lobed vs. unlobed, etc.
