C. It makes a clear claim and relates to vaccinations.
<span>Canton flannel gulls flew near and far. Sometimes they sat down on the sea, near patches of brown seaweed that rolled on the waves with a movement like carpets on a line in a gale. i think that you can see that nature has its own power</span>
I would probably say plump.
Essentially, in this question, you're looking for the word that would be the least insulting. More broadly, when asked about positive connotation, you're looking for a word that is not viewed negatively.
Words like fat and cheap have negative connotations, especially when applied to people. Words like plump and frugal are much more positive.