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.
The word <em>over </em>is used as an adverb in this sentence.
If the sentence said - There will be clouds over most of the country, then it would be a preposition.
2) stays
3) don’t invite
4) ‘ll go
5) don’t leave
6) ‘ll be
