Help will mark b if right

Dogs make wonderful pets because they us stay happy and healthy. the topic sentence is "dogs make wonderful pets." , is this correct? i keep doubting myself.

What type of external conflict occurs in the excerpt from “stephen crane’s own story”? it was now that the first mate showed a sign of losing his grip. to us who were trying in all stages of competence and experience to launch the lifeboat he raged in all terms of fiery satire and hammerlike abuse. but the boat moved at last and swung down toward the water. a. person versus person b. person versus nature c. person versus society d. person versus self i think its either b or d.

Read the excerpt from poe’s "the fall of the house of usher." his ordinary occupations were neglected or forgotten. he roamed from chamber to chamber with hurried, unequal, an objectless step. the pallor of his countenance had assumed, if possible, a more ghastly hue -- but the luminousness of his eye had utterly gone out. which statement best describes the effect of the narration on the story? the narration reveals usher’s feelings of discouragement. the narration reveals usher’s absent-mindedness after his loss. the narration suggests usher’s confusion in the wake of his loss. the narration suggests usher’s mental decline after his sister’s death.