The detail that best demonstrate Griselda's stoically patient attitude is She admits that her "lowly condition" is "at odds" with her husband's nobility.
Stoically attitude is about holding serenity even in adverse life situations and in the Tenth Day: Tenth Story even after being through many patient tests from Gualtieri when Griselda is back to her father's house she still admits to herself that with having her both children killed, her marriage ended is her condition the reason of all, adopting then a rational view rather than emotional attitude to her problems.
That it is a good circus and it was well known at the time.
The answer is D
I just did the question
What you need to do is find the square root of each number.
sqrt 50 = 7.07106781
sqrt 72 = 8.48528137
sqrt 45 = 6.70820393
(Sqrt means square root)
Hope this helps!