<span>The answer is:</span>
c.
Compound-Complex
<span>The given
sentence is an example of a compound-complex sentence because it consists of
two independent clauses which are “These
writings have been determined to be as old as 2,600 years” and “they must be carefully
protected behind glass” and
one dependent clause which is “because they are so
old”.</span>
For the best answer i would go with D
Hope this helps ;)
Understand the reading better
