Looking back, our inability to confirm speakers gave us the maximum headaches.
Looking at it with hindsight our inability to confirm speakers gave us the maximum headaches.
On hindsight we find that our inability to confirm speakers gave us the maximum headaches.
On hindsight, our inability to confirm speakers gave us the maximum headaches.
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The Correct Option isA
Solution and Explanation
The sentence is about reflecting on past difficulties.
“Looking back” is a simpler, more natural expression than “on hindsight” or “looking at it with hindsight.”
Option (B) is longer and more awkwardly phrased with “looking at it with hindsight.”
Option (C) is incorrect in usage — the standard expression is “in hindsight” not “on hindsight,” and “we find that” is unnecessary here.
Option (D) also uses “on hindsight” incorrectly.
Option (A) is correct because it uses the idiomatic “Looking back” and keeps the sentence clear and concise.