Question

which is a sentence fragment? two hydrogen atoms and one oxygen atom compose each molecule of water. my parents’ business flourishing, thanks to online advertising.

Explanation:

A sentence fragment is an incomplete sentence lacking a main verb or a complete thought. The first option has a subject ("Two hydrogen atoms and one oxygen atom") and a verb ("compose"), forming a complete sentence. The second option, "My parents’ business flourishing, thanks to online advertising," has a subject ("My parents’ business") and a participle ("flourishing") but no main verb to make a complete sentence, so it's a fragment.

Answer:

My parents’ business flourishing, thanks to online advertising.