Answer:
A. Synapomorphies identify monophyletic clades.
Step-by-step explanation:
Synapomorphy is a shared trait or character derived during evolution, that is commonly found between two or more taxonomic groups or descendants of the same ancestor. Synapomorphy differentiates a clade or monophyletic group from other organisms.
Synapomorphy helps with provide evidences common to an ancestry and also helps to identify clades and monophyletic groupings, such as the ancestral relationships highlighted in a cladogram.
An example of a Synapomorphy is the skeleton in gorilla and humans.