Which statement below is true based on the article?
a. Smog is no longer a problem
anywhere.
b. Brian Bone survived the killer Smog.
c. Fog harms people's lungs.
d. The Killer Smog caused 21,000 deaths.

can you explain it better

d.) continue to rise rapidly

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.