I think c) uses contrasts <span>between darkness and light to highlight his points.</span>
The first main phase of the 'Great Unrest' began with the rapid escalation of discontent in the South Wales oalfields. In this area wages were fixed not by individual or collective bargaining but by the price of coal. ... Discontent also simmered around the issue of 'small coal'.
I'd go with C) Analogy since it's comparing nature to liberty, which are two unalike things.
The following sentence contains an adverb clause.
This sentence contains two clauses - an independent clause (We moved) and a dependent/subordinate clause (because our house was too small). Given that the second sentence gives us a reason why they moved, it acts as an adverb, which is why it is an adverbial clause.
