Answer:
A
Step-by-step explanation:
Diagonals of a parallelogram bisect each other.
3x = 3
x = 1
y = x
y = 1
In a parallelogram, the parts in which each diagonal cuts the other are congruent.
This means that we must have
[tex]\begin{cases}3=3x\\x=y\end{cases}[/tex]
From the first equation we can deduce x=1, and thus y=x=1.