Step 1: Analyze sentence (i).
“He is the most ________ of the speakers to address us today.”
The word should mean “distinguished, well-known.” The correct word is Eminent.
Step 2: Analyze sentence (ii).
“The belief in ________ justice is the essence of his talk.”
Here the sense is of justice being “inherent or indwelling.” The correct word is Immanent.
Step 3: Analyze sentence (iii).
“This hall would have been full but for the ________ rain.”
Here the meaning is “about to happen, impending.” The correct word is Imminent.
Step 4: Analyze sentence (iv).
“Many in the audience have achieved ________ in their respective fields.”
Here the word must mean “high status or distinction.” The correct word is Eminence.
Thus the sequence is:
\[
\text{(i) Eminent,\ (ii) Immanent,\ (iii) Imminent,\ (iv) Eminence}
\]
\[
\boxed{\text{Option (C)}}
\]