What is the basic tool that had not been invented when the pyramids were built

Stones. Stones were not only the building blocks being used to create pyramids, they served as important tools as well. The two main stone types used in construction were limestone and granite. Low-grade limestone was used in creating the inner walls, while smoother white limestone was used on the outer walls.

the answer is option a.

you didn't post any options. a few things that spring is known to represent are: rebirth, birth, new life,   and life.