The conclusion which Olivia draws from Malvolio’s strange behavior in yellow stockings and cross garters is that he has gone mad and is denoted as option A.
This is a common term which is used to describe someone who is mentally deranged.Such person exhibits some types of behaviors in terms of dressing, speaking etc.
Olivia saw the way Malvolio dressed in yellow stockings and cross garters which was a strange to her thereby making her assume that something was wrong with the way he was thinking at that point in time.
This is therefore the reason why mad was chosen as the most appropriate choice in this scenario.
Read more about Behavior here https://brainly.com/question/1741474
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