Question

alan reluctantly decided to take a long - awaited trip to new zealand. the thing that is most disturbing to him is that he must leave his pet monkey behind. there is a \pet hotel\ in the city that has agreed to take him. should alan worry about him?
no. monkeys love new social situations, and their immune systems are actually strengthened by them.
yes. monkeys under stress due to social disruptions have weakened immune systems.
yes, monkeys under stress due to social disruptions tend to have increased lymphocyte production.
unknown. no studies have been done examining social disruptions and monkey immune systems.

Explanation:

Monkeys are social animals. When they experience social disruptions (like being separated from their owner and placed in a new environment like a "pet hotel"), it causes stress. Stress in animals (including monkeys) is known to weaken the immune system. Option A is incorrect as monkeys don't "love" new social situations in the sense that it strengthens their immune system - rather, it causes stress. Option C is wrong because stress - induced changes in the immune system of monkeys (due to social disruptions) do not involve increased lymphocyte production in a positive sense (it's more about immune system weakening). Option D is incorrect as there is scientific knowledge about the impact of stress (including from social disruptions) on monkey immune systems.

Answer:

Yes. Monkeys under stress due to social disruptions have weakened immune systems.