When you say a phrase like, $"$My day is like an unending marathon," you are using

a$)$ Metaphor.

b$)$ Symbolism.

c$)$ Simile.

d$)$ Parody.

When you say a phrase like, "The alarm clock declared its hatred for me by once again shrieking at me at $5$:$00$ a$.$m$.,"$ you are using

a$)$ Simile.

b$)$ Analogy.

c$)$ Personification.

d$)$ Sarcasm.