A good prediction question to ask after reading the sentence is 'How will Buck be affected by the unsettling news?'
Answer: Option D.
Step-by-step explanation:
‘The Call of the Wild’ is an adventurous novel by Jack London which illustrates the story of a sled dog. In the above mentioned sentence, Buck is a big hearted dog who is unaware of the trouble awaiting him because he didn’t read the newspaper. After this sentence, one would most certainly come up with a predicted question as in what effect the unsettling news will have on Buck. The line didn’t clearly mentions the news, it just depicts that something is about to happen in the life of not just Buck but other dogs as well.