Is the passage of dialogue written correctly or incorrectly?

"Why is the dog barking?" Jenna asked impatiently.
"She might smell a stranger approaching, "Grandpa answered.
"I don't see anybody from the window, " Jenna said. "The dog hasn't barked this long before," she continued.
"We should check for ticks," suggested Grandpa.

A. incorrectly
B. correctly