Remember to include positive effects on having a cat aswell as negative effects. A positive effect could be, having a friend like a cat can boost mood. (Make sure you research and find eveidence where this can be supported, just look up on google how cats help with depression or something like that).
A negative effect a cat can have would be they are moody sometimes and can scratch you. They aren't as loving as dogs and sometimes you seem like a servant. Always remember to have a opposite opinion paragraph when writing an essay.
I believe the answer is A.
Hang-dog originally means if you say that someone has a hangdog expression on their face, you mean that they look sad, and often guilty or ashamed.