Which sentence uses an effective transition for introducing a cause?

a. as a result, the house was saved but the fire trucks arrived quickly.
b. the fire trucks arrived immediately, and the house was saved.
c. because the fire trucks arrived immediately, the house was saved.
d. the fire trucks arrived immediately since the house was saved.

- "a nonrestrictive clause functions as a modifier to a noun (that is an object, person or concept). these clauses can be described by the following three options: it is set off by comas, it contains a subject and a verbs and it adds nonessential information to the sentence.

for example, in "here is bill gates, who confounded microsoft software company" we can identify "who confounded microsoft software company" as a nonrestrictive clause modifying the noun bill gates. this clause can be describes as a nonrestrictive clause because it is separated by a comma, it adds nonessential information to identify who bill gates is and it must contain both a subject (who) and a verb (confounded)."