to enrich
An infinitive is the basic form of the verb without a subject. When it is used in a sentence, it is preceded by "to". The correct answer is the one with a verb. To test it out just ask yourself if you can use it with the subject I after dropping "to". I enrich? Yes! Check, it's right. You can't say I the delight or I Tuesday mornings. The rest of the options are prepositional phrases because they start with the preposition to and end in a noun (person, place, thing, or idea).
Answer:
Since they are free writes, lyrics from my two favorite songs:
1) Often I am upset that I cannot fall in love but I guess
This avoids the stress of falling out of it
Are you tired of me yet?
I'm a little sick right now but I swear
When I'm ready I will fly us out of here
2) I'm afraid that's just the way the world works
It ain't funny, it ain't pretty, it ain't sweet
But I think that it could work for you and me
Just wait and see
It's not the end of the story
:)
You can often tell what a word means by its context in a sentence.