Answer:
The option (a) is correct
Explanation:
The statement that is correct is the first option which says since Jim is a gratuitous agent, he will only be responsible for the loss of the car if his conduct amount to gross negligence.
Gross negligence: refers to awareness or carelessness in reckless ignorance for the protection or lives of others and properties which is so great that it is visible to be a conscious violation of other people's rights to safety.
In this case Jim will be held responsible for the Donna's car been stolen if he was conscious of what he did by leaving the keys in the car deliberately even when it to get stolen.