B would be really effective I'm sure but I don't know because D kind of hooks me. Probably the answer is B but D panders to me personally for some reason. But it's safe to say that this: "For several years after the death of her husband Albert, Queen Victoria of England remained in mourning." is a little bit more clear than this: "Queen Victoria of England remained in mourning for several years after the death of her husband, Albert." and it varies the sentences pretty effectively.
Because she was upset that the people of her country were 1. committing an act of domestic terrorism and 2. not accepting the results of the election that put her as vice president elect.
