PLEASEE HELP ME
Which conjecture is valid by the Law of Syllogism for the following scenario? “If Joe buys Nancy a card, he will give it to her. If Nancy is having a birthday, then Joe will buy her a card.”
A If Nancy is having a birthday, then Joe will give her a card.
B If Joe buys Nancy a card, then she is having a birthday.
C If Joe gives Nancy a card, then he bought the card.
D If Joe gives Nancy a card, then she is having a birthday.