A taxonomic key used to identify organisms is labeled
A. Phylogenetic key
B. Evergreen key
C. Dichotomous key
D. None of the above

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Hint: A dichotomous key is used for that allow the user to determine the identity of the living organisms in the natural world, for eg. Mammals, trees, reptiles, wildflowers, rocks, and fish.
Thus the taxonomic key used to identify organisms is labeled Dichotomous key

Complete answer: A dichotomous key is a method for determining the identity of something (like the name of a butterfly, a plant, a lichen, or a rock) by going through a series of choices that leads the user to the correct name of the item.
The Keys includes a series of find out the leads that offer users the right name of a particular given organism in the natural system.
Dichotomous" means divided into two parts and dichotomous keys that always give two choices in a taxonomic study in each step.
In which to identify a plant or animal every step presents descriptions of two different characters and with a direction to the next step in the key, until the species is recognized.

Steps involved in making a Dichotomous Key
Step 1: List down the characteristics
Step 2: Organize the characteristics in order
Step 3: Divide the specimens
Step 4: Divide the specimen even further
Step 5: Draw a dichotomous key diagram
Step 6: Test it out.

Thus, the correct is the Dichotomous key.

Note: Although the term key was developed by John Ray, Jean Baptiste Lamarck, is the person who developed the dichotomous key.