If the activities listed are all part of the same WBS that has three levels and top level 1.0, according to the PMI definition which one represents a Work Package?

If the activities listed are all part of the same WBS that has three levels and top level 1.0, according to the PMI definition which one represents a Work Package? Select one: O a 10 Build House O b. 3.3.3 Excavate O c. 111 Survey Od 3 Build Frame O e. 193 Final Inspection