What is the subordinate clause in this sentence?

as i was walking, i stumbled upon a beautiful seashell.

a.
as i was walking

b.
i stumbled upon

c.
a beautiful seashell

The subordinate clause in this sentence is A As I was walking

A subordinate clause begins with a conjunction or a relative pronoun and it doesn't have all the necessary information no convey an idea, Option A best represents this kind of clause, Options B and C are part of the main clause so they can not be considered as two different clauses.

chapter i -- paris: september, 1792

a surging, seething, murmuring crowd of beings that are human only in name, for to the eye and ear they seem naught but savage creatures, animated by vile passions and by the lust of vengeance and of hate.

during the greater part of the day the guillotine had been kept busy at its ghastly work: all that france had boasted of in the past centuries, of ancient names, and blue blood, had paid toll to her desire for liberty and for fraternity.

hope this answer you: )!

the answer is: the start of world war i, and russia’s hopes of benefiting from it

during world war i russian joined due to in their current crisis they were being supported by france and the war was already declared to them by germany, they needed to maintain their political goal and leadership role in the balkans, and is the same feeling that this excerpt evoke the eager of maintain the land value.