Step-by-step Analysis:
• Phrase (A) contains the subject:
“most roads and routes across Delhi NCR”
Therefore, it is a natural opening phrase.
• Phrase (B) contains the main verb:
“appeared as a crimson streak on real-time traffic maps”
Thus, it should follow the subject.
• Phrase (D):
“indicating high traffic volume”
explains what the crimson streak signifies.
Therefore, it naturally follows phrase (B).
• Phrase (C):
“and increased travel time”
presents the consequence of heavy traffic and should appear at the end.
• Combining all phrases gives:
“Most roads and routes across Delhi NCR appeared as a crimson streak on real-time traffic maps, indicating high traffic volume and increased travel time.”
This sentence is grammatically complete and logically meaningful.
Hence, the correct sequence is:
\[
(A)\rightarrow(B)\rightarrow(D)\rightarrow(C)
\]