Answer:
B. Sentence fragment
Explanation:
These words, That instrumental composition in my backpack on the counter can be seen like it is a complete sentence but in actual truth. It is not.
A sentence fragment is a group of words that kind of looks like a sentence but the fact is that they are not a complete sentence. They are usually lacking a subject or a verb or it could just be that they do not express a complete and correct thought. A phrase can be considered to be a sentence fragment
