Which statement show the causes that led to the decline of the old kingdom

Explanation: There were several factors that contributed to the decline of the Old Kingdom, but the most important issue was the erosion of the authority of the Pharaoh and the accompanying growing power of the nobility and priesthood. This led to the decentralization of power in Egypt and constant power struggles and civil war.

a sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°c. if the system is at dynamic equilibrium, which of these statements is true?  

what are the options?