I think the it is B hope that helps
Answer: Teaching given by Marta is about the language usage so that control over intense feeling can be achieved
Explanation: As Marta's son got tired from the zoo trip and also got slight injury on the knee , she is trying to calm him with the talk as he is angry and upset. The intense feeling of anger and distress is required to be calmed doen so Marta is taking about the good events of the zoo.
Language in the form of taking is playing the role as the controlling medium. By talking about fun and tiring day she is trying to teach Roberto about the controlling the intense feeling through the medium of language.
The dependent variable is the mood of the participants.
The study aims to assess how the level of exercise (measured by the amount of time spent) affects another variable, that, in turn, will be the dependent variable: the mood of the participants. The aim of the study is to conclude whether it is possible or not to infer causality between those two, in other words, to see whether different levels of exercise (<em>the cause</em>), trigger the emergence of different types of mood (<em>the effect</em>).