Select the most appropriate meaning of the highlighted idiom in the given sentence.
I had never seen him lose his temper, and he governed our company with an iron hand.

Correct option is D

Option (d) is the correct meaning of the given idiom.
With an iron hand: To rule or control someone or something in a very strict, harsh, or authoritarian manner.
Example: The dictator ruled the country with an iron hand, suppressing any opposition.
Other related idioms and their meanings:
· With a firm hand – In a strict and disciplined manner.
· Hold the reins – To be in control.