Which of the following passages uses the word “meanwhile” correctly?

A
I quickly ran to the store for more napkins. Meanwhile, “I’ll be back!” I shouted, to my unconcerned guests as I hurried out the door.

B
I met my grandfather at the station. Meanwhile, I had really missed him.

C
My cousin often sleepwalks. Meanwhile, she thinks it is because of her realistic dreams.

D
The mayor supported building a new swimming pool. Meanwhile, the town’s citizens opposed the plan.