Beowulf uses no weapons to kill Grendel.
B. False
(For the future, if it is an opinion, it is probably false)
It seems that you have already filled the correct pronoun in the blank provided. Yes, the correct answer to complete this sentence is the pronoun "this". The pronoun "this" is an example of a demonstrative pronoun. Other demonstrative pronouns also include these, those, and that. Hope this answer helps.
You can play with what you see in the box.