The correct option is B Jenna was always careful to mind her P's and Q's when her husband's mother visited her.
The words 'mind one's P's and Q's' is an expression that means 'mind one's manners' or 'mind one's language'.
"P's and Q's" (or Ps and Qs) originally means 'pints and quarts'. These letters refer to plural words, and hence they are followed by apostrophes. However, many people leave out the apostrophe and let the 's' remain. But, it is preferred to keep the apostrophe '.
Option B: This option is correct because the apostrophes have been sufficiently placed, at "P's and Q's" and "husband's". The apostrophe for husband denotes possession 'the mother of her husband'.
Option A is incorrect because the apostrophe ' after 'husbands' is missing.
Option C is incorrect because the apostrophe has been placed after 's'; it has changed 'husbands' to a plural noun, meaning that she has more than one husband. But, (even if that's the case), there's only one mother in question. Hence the sentence is ambiguous in meaning.
Option D is incorrect because the sentence requires change, at 'Ps and Qs' and 'husbands'.