The given logical expression says that

“For Every person A, there is some person B, such that at some time T, A can Not fool B at T.”

For everyone we can find someone whom at some point of time they cannot fool.

So, No one can fool everyone at all times.

More easily, we can write the given logical expression in Equivalent form using De-Morgan’s law, as

$ ¬ ∃x∀y∀t(F(x, y,t)) $ which says that “Noone can fool everyone at all times.”

$\color{red}{\text{Analysis of Option D:}}$

Option D is saying that Noone can fool anyone at any time.

It is like saying that: in a group of friends, “Noone can betray anyone at any time.”

Logical Expression:

$¬ ∃x∃y∃t(F(x, y,t))$ ; which is Not equivalent to the given logical expression in the question.

$\color{red}{\text{Analysis of Option A:}}$ $\color{}{\text{}}$

Option A says that “Everyone can fool some person at some time”, for which logical expression will be:

$∀x∃y∃t(F(x, y,t))$ ; which is Not equivalent to the given logical expression in the question.

Statement in Option C seems ambiguous(interpretation ambiguity) when reading it.