THe answer is A. Themselves. A reflexive pronoun indicates that the person who is realizing the action of the verb is also the recipient of the action.
Answer:
Meg overhears the Moffat sisters discussing her family's financial troubles.
Explanation:
hey are speaking about the fact that Meg has received flowers from Laurie. Because they are not engaged, the Moffat sisters discuss the idea that Meg mus be "scheming" to get him to propose. Their marriage would help correct the family's financial woes.

Sentence is a group of words which makes a complete sense.