Which sentence uses an prepositional phrase unidiomatically?

Responses
A Everyone cheered when the man arrived with the pizzas.Everyone cheered when the man arrived with the pizzas.
B Although it was raining, my books stayed dry inside my backpack.Although it was raining, my books stayed dry inside my backpack.
C That poem is meaningful to me because it reminds me of my grandmother.That poem is meaningful to me because it reminds me of my grandmother.
D My mom began laughing out of the blue when she saw me dressed in a clown costume

My mom began laughing out of the blue when she saw me dressed in a clown costume.