Question

The following sentence contains _____.

The Mason-Dixon line, which is perhaps the most famous border ever established by surveying methods, has been designated a National Historic Landmark.
one main clause
two main clauses
one main and one subordinate clause
one main and two subordinate clauses

Answer 1

one main and two subordinate clause

Answer 2

One main and one subordinate clause

Step-by-step explanation:

While main clauses, also known as independent, are groups of related words expressing a complete thought and therefore, can stand on their own, subordinate clauses do not have a full meaning on their own, and can not stand alone as full sentences. The sentence provided contains one main clause which it's “The Mason-Dixon line has been designated a National Historic Landmark,” and one subordinate clause: “which is perhaps the most famous border ever established by surveying methods,” whose function is to provide additional information about the noun “The Mason-Dixon line,” that is, to act as a non-defining relative clause.