Topic: Linkers or Connectors,

Best Answer Explained in Below-:

In the sentence "I saw a blind man -- I was walking along the road," we need to establish a temporal relationship between the two actions: seeing the blind man and walking along the road. The use of conjunctions clarifies this connection.

The correct option, "while," indicates that the two actions were happening concurrently. When we say "I saw a blind man while I was walking along the road," it implies that the action of seeing occurred at the same time that the action of walking was taking place. This creates a smooth flow and a clear idea of simultaneous events.

In contrast, the other options do not fit as effectively. "At the time" would be grammatically awkward and less direct, lacking the immediacy of concurrency. "When" could work but is less specific about the overlap of the actions. "Before" suggests a chronological order that implies one action occurred prior to the other, which is not the intent in the context of the original sentence.

Thus, "while" is the most suitable choice to convey the intended meaning of simultaneous actions.