Singing loudly in the shower is what Jessica loves to do every morning.

gerund phrase
participial phrase
appositive phrase ***
prepositional phrase

The janitor told Principal Johnson he put the cleaning materials where he always left it.
independent clause
noun clause
adverbial clause ***
adjectival clause

When I made dinner for the family, they were all properly amazed.
misplaced modifier
subordinate clause ***
complex sentence
compound

No directions?

What are the clauses/phrases???

Oh, I'm sorry. I didn't tell you what to identify in the sentences.

1.[Singing loudly in the shower]
2.[where he always left it.]
3.[When I made dinner for the family, they were all properly amazed.]

1. incorrect

2. correct
3. correct

Would #1 be D?

You're guessing!

Study this and then make an informed choice!
http://www.ucalgary.ca/uofc/eduweb/grammar/course/sentence/2_4d.htm

Or this:

http://www.chompchomp.com/terms/phrase.htm

I understand what a preposition is. A preposition is a word that describes the relationships between two nouns or pronouns.

For example:

"The duck is next to the pond." (next to the pond)
So that's why I thought #1 would be D.

There's no preposition at the beginning of this phrase:

1.[Singing loudly in the shower]

In that second link, read carefully about the four possibilities ... you can safely ignore the others.

Study it carefully before you re-post.

would #1 be a participle?