there are 3 comparison:
population of 13-65 vs population 13<>65
amount of garbage of 13-65 vs amount 13<>65
percentage and indirectly amount of garbage each year.
the cause relation indicates that the increasing amount every year is caused by increasing amount of 13-65 => percentage of garbage of this group increases => D is correct.
More importantly, this is a conclusion question, not an inference question. In the latter, what is inferred must be true.
In some questions,
...
population of 13-65 vs population 13<>65
amount of garbage of 13-65 vs amount 13<>65
percentage and indirectly amount of garbage each year.
the cause relation indicates that the increasing amount every year is caused by increasing amount of 13-65 => percentage of garbage of this group increases => D is correct.
More importantly, this is a conclusion question, not an inference question. In the latter, what is inferred must be true.
In some questions,
...
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