Answer:
Capulet decides to marry his daughter Ju liet to Paris on Thursday.
His motivation is that the sooner she gets married, the happier she will be after the sad news of her cousin's death, which he thinks, have affected her greatly.
The problem that he is unaware of is that Romeo and Ju liet are already married, which makes Ju liet a married woman.
Explanation:
William Shakespeare's Romeo and Ju liet revolves around the love story of Romeo and Ju liet, two star crossed lovers of feuding families. Their love may have bee forbidden which also leads to their deaths but it also ends the rift between the two families.
In Act III scene iv, Paris visits the Capulet family after the death of Tybalt in the hands of Romeo. It is in this scene that Capulet decides his daughter's marriage with Paris be done sooner rather than later. So, Thursday was decided as the day that Paris and Ju liet will be married.
His motivation for the decision was that the sooner Ju liet gets married, the happier she will be. The death of her cousin Tybalt is only making her sadder, so if she gets married, she might become happy again.
The problem that he is unaware of but the audience knows is that Ju liet is already married to Romeo, the son of their enemy Montague.
