{ 1 } - deserves praise and encouragement.
{ 2 } - deserves moral esteem.
{ 3 } - both of the above.
{ 4 } - none of the above.

Kant says that this motivation is "proper and amiable" and "deserves praise and encouragement." But the motivation could be even better.

A higher motivation is to do good to others because this is the right thing to do -- and because you have concern for them for their own sake (as "ends in themselves"). This will carry you through even if you cease finding pleasure in doing good to them.