Answer:
b. munificence
Step-by-step explanation:
The word munificence is a synonym for the word generosity.
Munificence is related to the ability of a being to give money and other possessions to others.
In this sense you can be munificent giving expensive gifts to other people to show interest in them or to generate complacency.
In the sentence given, munificence is expressed as the generosity that manifests itself by giving gifts to attract the opposite gender.