Concept:The right word must describe how the man's influence becomes weaker or less important over a period of time.
Explanation:"Diminished" means reduced in size, strength, importance, or influence.
It fits the sentence perfectly because it shows that the man's influence has gradually lessened over time.
"Toppled" means overthrown or knocked down from power, so it does not fit this context.
"Quelled" means suppressed, calmed, or put to an end, which is also unsuitable here.
"Discarded" means thrown away as worthless or no longer useful, so it cannot be the correct option.
Therefore, the only option that correctly expresses a gradual reduction of influence is "diminished".
Answer:Option C. diminished.