Identify the subordinate clause in the following:
Mr. Desouza will not begin his day until he has had his first cup of coffee. [Advanced]
Subordinate clauses start with conjunctions or prepositions and cannot exist without the on the main clause. Here “until...coffee” is dependent on “Mr.Desouza...day”. Hence, Option C is correct. The rest of the options do not fit this description, hence incorrect.