The toxic effects of water pollution are generally
a. immediate and long-lasting
b. immediate and short-lived
c. delayed and long-lasting
d. delayed and short-lived select the best answer from the choices provided a b c d

The right answer here is A - the toxic effects of water pollution are generally immediate and long-lasting. Once a source of water pollution has begun to effect a supply of water, for example a badly connected drainage or sewage system, due to how fast a contaminant spreads amongst water any toxicity will spread quickly and then remain in the water for a long time.

Ithink it would be a and b