Sentence Analysis:
When a tunnel providing water to the city of Bogotá, Colombia, partially collapsed in 1997, (DC clause)
it triggered a water shortage, (IC1)
the city government declared a public emergency and initiated a communication program to warn inhabitants of the threat of a crisis. (IC2 with 2 parallel verbs in X and Y structure )
Two IC clause joined only by a "," - Definite error in grammatical structure.
IC,IC is wrong grammatical structure.A) it triggered a water shortage, the city government declared a public emergency and initiated a communication program to warn inhabitants of the threat of a crisis.
Error as above.
B) it triggered a water shortage, with the city government declaring a public emergency and initiating a communication program to warn inhabitants of the threat of a crisis.
IC,IC error is corrected but the sentence does not communicate the main logical idea properly.
" with the city government declaring a public emergency and initiating a communication program to warn inhabitants of the threat of a crisis." -> these actions did not happen with water shortage rather water shortage led the govt. to take these actions. Main Idea is to communicate that city govt did 2 actions when tunnel collapsed led to water shortage.
We need proper form of verb "declared" and initiated" instead of the modifier usage here to communicate logical meaning.
C) triggering a water shortage, the city government declaring a public emergency and initiating a communication program to warn inhabitants of the threat of a crisis.
No IC clause is present in the sentence. "triggering, declaring and initiating" all are modifier. We need min. 1 IC.
D) triggering a water shortage, the city government declared a public emergency and initiated a communication program to warn inhabitants of the threat of a crisis.
Hold - corrects the original error and Sentence structure is clear as well.
E) triggering a water shortage, a public emergency was declared by the city government and a communication program initiated for warning inhabitants of the threat of a crisis.
Parallelism structure is not correct grammatically in the Main Clause.
a public emergency was declared by the city government (clause) and
communication program initiated for warning inhabitants of the threat of a crisis. (Noun phrase) -> Further, not clear who is doing action of program initiation
"for warning " is inferior in construction to " to warn"
D is the winner here.