It can reasonably be inferred from the passage as a whole that the narrator views her mother's bargaining skills as ones that were developed:
F. to a degree that was exceptional even in Saigon but that have no apparent outlet in the United States.
G. to a degree that is commonplace in the competitive sky markets but that is exceptional in the United States.
H. to a lesser degree than those of most sky market shoppers in Saigon but to a degree that seems exceptional in the United States.
J. solidly and irrevocably over years of shopping in Saigon, putting her at an advantage in the challenging circumstances of her adopted home.
so if we want to know when it's strictly increasing than strictly decreasing, then we have to find when the graph goes up and then goes down it because it's a strictly increasing, strictly decreasing. We don't want, like a lab period where there's like nothing going on. We don't want this and this and like and then this is a minute that was Overall, this graph is also increasing and decreasing. With this middle part. There's like a little bit of a laugh. So if we want to find when it goes up and down, well, that looks like this period right here and that is between forty and sixty minutes. So we're going to choose B.