Answer:
b. to persuade, motivate and inspire the troops to battle
Explanation:
The direct object is amazed
Princess is already in singular form. To make something posessive, you need to add either 's or '. Since the last letter of "princess" is an "s" the answer would be princess'.
D. Mrs. Mallard had loved her husband, but she is happy that she is free.
I think this is accurate, and out of the options it looks like the best choice, but I am not certain.