to inform readers about seeing-eye dogs
I’m pretty sure it is C. Explicit. I could be wrong but Explicit means saying something directly, it is not implied.
Since misery and depression are both sad/bad kinds of feelings, then we have to find a pair of words that have the same kind of feeling in order to complete this analogy. The correct answer should be melancholy and boredom.
19th-Century Expectations
In both North America and Europe in the 19th century, women and men were expected to fill separate spheres of society. Men were expected to live a public life, whether it was working in a factory or socializing with like-minded men in public places, like clubs, meetings, or bars. On the other hand, women were usually expected to live their lives at home, taking care of the cooking, cleaning, and child rearing. Free time for women was not supposed to be spent socializing but doing other things related to the maintenance of the family, from sewing socks to laundry.