Write a question about the following article.

When I was in Kenya , I got down to an anemic and unattractive 155 lbs . That was admittedly too skinny . But last weekend , while cat sitting for a friend with an electronic scale , I stepped on ( fully clothed ) to see a rather unexpected number : 206 .

Question:
Why were they at their friend 's house ?
Select from:
1). they were watching the dog;
2). None of the above choices .;
3). to use their fancy scale;
4). they were keeping an eye on the cat;