I believe is A) Inner core
Answer:

Explanation:
= Force on one side of the door by first waiter = 257 N
= Force on other side of the door by second waiter
= distance of first force by first waiter from hinge = 0.567 m
= distance of second force by second waiter from hinge = 0.529 m
Since the door does not move. hence the door is in equilibrium
Using equilibrium of torque by force applied by each waiter

It requires skill and eye coordination!!
Answer:
C is the best answer because we all know that clock is part of our daily lives but we don't know the about its background
Answer:
I need this for may schooling