"The captain stood with folded arms, silent, observing the work of his subordinates, but making no sign. Death is a dignitary who when he comes announced is to be received with formal manifestations of respect, even by those most familiar with him. In the code of military etiquette silence and fixity are forms of deference."

What is the meaning of the word manifestations as it is used in the previous sentence?
Responses
A greetingsgreetings
B refusalrefusal
C signssigns
D vagueness