Complete the zookeeper's strict instructions before you enter the habitat.

"Please remember that ___ the monkeys in this enclosure are on a strict diet, so do not feed a single one of them!"

The correct answer is all.

All is unique on the quantifier spectrum because it can be used directly before "the + noun" (all the monkeys).

• "Most" and "some" require the preposition "of" when placed before "the" (e.g., most of the monkeys, some of the monkeys).

• "Every" must be followed by a singular noun without "the" (e.g., every monkey).