Tempo markings at the beginning of a score indicate a mandate tempo that should not be changed throughout the entire piece

I think it is called something like a time signature or meter

Explanation:

i believe the answer is: a.  abstract forms were often used to represent human figures.

representing human figures in abstract forms is often used in the geometric period, not hellenistic  period.   during the hellenistic  period,   aesthetic value derived from creating arts which mimic the actual shape of a certain object or individuals.

hope this ! < 3