Which of the following structures is the most important contributor to the resonance hybrid formed when toluene undergoes para nitration? 
Definitions:
Bird-like Hip
A type of pelvis structure found in some dinosaurs characterized by a forward-tilting pubis, similar to that of birds.
Mesozoic Era
A geological era that occurred between 252 and 66 million years ago, characterized by the dominance of dinosaurs.
Paleozoic
An era in the geologic time scale, occurring from about 541 million to 252 million years ago, noted for the early development of life on Earth.
Crinoids
Marine animals belonging to the class Crinoidea, characterized by a mouth on the top surface surrounded by feeding arms, part of the echinoderm phylum.
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