The question refers to The Call of the Wild, a book that narrates the story of Buck, a dog which lived in Santa Clara, California, and was taken away from his home to serve as a sled dog in Alaska. It was written by American author Jack London and first published in Canada. In this case, the question refers to the offspring of an animal, so the correct answer is progeny.
If it makes it easier, when trying to find the direct object in a sentence you have to ask yourself what the subject is receiving. What did Mr. west study?
Mary Cassatt, one of America's first great female painters, has one of her paintings of a mother and daughter hanging in the White House.
Mary Cassatt's painting "Young Mother and Two Children" hangs in the White House as testimony for her importance as one of America's first great female painters.
