Explanation:
Where Jimmy works: he has a "position in one of the <u> </u><u>best</u><u> </u> departments. "
Paired conjunctions
Either......or
Neither......nor
Not only.....but
Iwill go either to Rio or Bahia on my vacation
Neither John nor Mary speaks French
Not only does he speak French,but also German
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.
