Answer:
<em>B, Preparing for the experiment, several slides were fixed with dye.</em>
Explanation:
<h3>
Modifiers</h3>
Modifiers are simple words or phrases used to add emphasis to another word in a sentence. Adjectives and adverbs are used to provide emphasis to nouns and verbs respectively. Clauses and phrases can also be used as modifiers in a sentence. <em>The </em><em>nice </em><em>Child; </em><em> </em>In the example, the adjective shows us that the Child is nice and it is the modifier.
<h3>Dangling Modifiers</h3>
A modifier is considered dangling when the word that its will modifier is not contained in the sentence. For example, the nice ........; the nice in this example is dangling because it does not have a word to modify.
Preparing for the experiment, several slides were fixed with dye contains a dangling modifier. "Preparing for experiment" is expressing an action, but the person experimenting is not known. Since the person performing the experiment is not known the phrase "<em>preparing for the experiment</em>" is considered a dangling modifier because it is not modifying any word in the sentence.