It's Called Chivalry. It is their chief honor code, instituted in the middle ages.
<span>When a social group is isolated for a long time, customs tend to ossify - making change difficult.
The verb <em>to ossify </em>in its primary meaning refers to bones hardening, to stiffening, fossilizing, solidifying, hardening. Its metaphorical meaning would be to stagnate, to cause difficulties, to cease developing, which is the meaning in the sentence above. </span>
My friend's hair is very sleek.
The coral reef is home to many types of fishes.
She would wheeze even after taking her cold medicine.
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C. Is the fragment you are looking for.