Answer:
astronomy is the correct answer
The answer is C, Beleaguer.
Siege means blockade. Beleaguer has the closest definition of "cause problems or difficulties for."
hopefully this helps! have a nice day/night and good luck in your class :)
In the story "the call of the wild", we can conclude that Buck's life in the santa clara valley is happy and easy.
I hope my answer has come to your help. Have a nice day ahead and may God bless you always!