The correct answer should be additionally.
The word additionally would provide the best transition between these two sentence. It is so because you have one idea in the first sentence, and then you want to show another idea very similar to the first one in the second sentence. Using additionally to convey that is the way to go.
In the village described in "my father writes to my mother," when a woman speaks about her husband, it is customary for her to refer to him as her husband, the one whom she has given her commitment and trust towards the end of their lives. They have to stay in tact in order to live longer together.
I believe this answer is d D <span />
