pls, tell me what is run on sentence. Thank you

Is it D?
As a result of is correct idiom.

duongthang wrote:pls, tell me what is run on sentence. Thank you

A run on means no logical connector or incorrect logical connector used between 2 independent sentences...

In this case, overall structure is a cause and effect...hence "And" in B is not suitable..

Cause...effect..

As a resut of X, Y

The questions also tests concepts of modifer..what is largest? is the Library largest or the place largest....

A run-on sentence is a sentence in which two or more independent clauses (that is, complete sentences) are joined with absolutely no punctuation or conjunction.

Choice B --> causes this run-on sentence error by not separating the clauses with a punctuation.

Choice C --> "Because of the result of the destruction..." awkward construction.

Choice D --> Seems OK to me, but I think there is a misplaced modifier error in this construction. The "the largest of the ancient world" modifies Alexandria instead of the library.

Choice E --> "and the result was later generations..." I was expecting the relative pronoun that to come in between, "and the result was that later generations..."

My answer is A. What is the OA?

When a sentence consists of more than one clause, those clauses must be joined properly. It is never acceptable
to hook two clauses together with a comma, as the “sentence” below does. That’s called a run-on sentence.
Wrong: Nietzsche moved to Basel in 1869, he planned to teach classical philology.
There are a number of acceptable ways to fix a run-on.
1. Make two separate sentences:
Nietzsche moved to Basel in 1869. He planned to teach classical philology.
2a. Change the comma to a semicolon:
Nietzsche moved to Basel in 1869; he planned to teach classical philology.
2b. Join the clauses with a semicolon and a transition word such as however or therefore.
Nietzsche planned to teach classical philology; therefore, he moved to Basel in 1869.
Some common transition words are:
also consequently
however nevertheless
then thus
besides furthermore
hence otherwise
moreover still
therefore
3. Join the two sentences with a coordinating conjunction:
Nietzsche moved to Basel in 1869, and he planned to teach classical philology.
The coordinating conjunctions are:
and or
for but
nor yet
4a. If doing so is appropriate to the meaning, you can join the sentences with a subordinating conjunction:
Because Nietzsche planned to teach classical philology, he moved to Basel in 1869.
There are many subordinating conjunctions. Here are some of the most common ones:
although if
though where
so after
since unless
while therefore
because than
until thereby
before
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4b. A special kind of subordinate clause is a relative clause. Relative clauses usually begin with who, that, or
which, and they relate the information in one clause to the subject of the other clause: Nietzsche, who
planned to teach classical philology, moved to Basel in 1869.