The sentence contains two clauses: one independent clause and one conditional dependent clause. The correct answer is option a.
To understand the types and number of clauses in the sentence "If we prepare tonight, we will have less to do tomorrow morning," we need to identify both clauses.
Independent Clauses contain a subject and a verb and can stand alone as a complete sentence, while dependent clauses also contain a subject and a verb but cannot stand alone.
In the given sentence, "we will have less to do tomorrow morning" is an independent clause because it expresses a complete thought. The segment "If we prepare tonight" is a dependent clause because it is introduced by the subordinating conjunction "if" and cannot stand alone.
Therefore, the sentence consists of two clauses: one independent clause and one conditional dependent clause, making the correct answer a. 2 clauses; One conditional dependent clause and one independent clause.