Select the Best Translation into Predicate Logic, Using the Following

Multiple Choice

select the best translation into predicate logic, using the following translation key:
a: Ahmed
b: Bhavin
c: Chloe
d: Delfina
e: Eduardo
i: Irving
f(x) : the father of x
g(x) : the mother of x
f(x,y) : the only son of x and y
Lxy: x loves y
Sxy: x is a sister of y
Txy: x teaches y
-No one is the only son of Ahmed and Delfina.

A) (∀x) (x≠a • x≠d)
B) (∀x) f(x,x) ≠f(a,d)
C) ∼(∃x) x=f(a,d)
D) ∼(∃x) f(x)
E) ∼(∃x) f(x) =f(a,d)