Why the answer is A?

hi

for A)

if x=-3 then (-3+3)(y-4)=0

so 0 * (y-4)=0

and any number multiplied by 0 is equal to 0

ex: y=10 then 0 * (10-4)=0

for B)

fro y=-4 then (x+3)(-4-4)=0

so (x+3)(-8)=0

-8x-24=0

x=3 so only one possible value of x satisfies the equation

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