Yes, the answer is B. When you put yourself in someone else's shoes, it's a metaphorical statement. You aren't replacing a person, changing roles with them, of being jealous of them. However, you are looking at something from the way they see it.
Its a symptom of any number of things; Pericardial Tamponades (fluid buildup of sac surrounding heart), a heart contusion, a dysrhytmia like Ventricular Fibrillation or Ventricular Tachycardia...
Well, It depends of what the breed is, I don't think there is an answer of how many dogs die at age 5, It varies.
Gloves tubes to put blood in