Which writing mistake is demonstrated in the sentence below?

I have trouble concentrating sometimes. Especially when I can hear people talking.
(1 point)
Responses

run-on sentence
run-on sentence

adverbial clause fragment
adverbial clause fragment

adjectival clause fragment
adjectival clause fragment

separate sentences

The writing mistake demonstrated in the sentence below is a "sentence fragment." Specifically, it's an adverbial clause fragment. The second sentence, "Especially when I can hear people talking," cannot stand alone as a complete sentence because it lacks a subject and a verb; it's a dependent clause that is meant to provide additional information to the main clause.

Correct options based on your desired format:
- adverbial clause fragment
- adverbial clause fragment