F(x, y, t) = person x can fool person y at time t.
For the sake of simplicity propagate negation sign outward by applying de morgan's law.
∀x∃y∃t(¬F(x,y,t)) = ¬∃x∀y∀t(F(x, y, t)) [By applying de morgan's law.]
Now converting ¬∃x∀y∀t(F(x, y, t)) in english is simple.
¬∃x∀y∀t(F(x, y, t)) = There doesn't exist a person who can fool everyone all the time.
Which means No one can fool everyone all the time.
So option B is correct.