It defines culture and surroundings and environment
if it's about ruling TX then probably C or D.
The correct option is A.
Literally, to be inflexible means to be quite unwilling to change or to compromise. An inflexible person will not be ready to bend or be flexible in any way. To have a stone of heart means that the person is inflexible. Because of the nature of stone, a stone will remain a stone forever, it can not be changed, thus, to have a heart of stone is to be unchangeable, inflexible, uncompromising.