Which choice is an example of an incorrect or illogical comparison?

this magazine has longer articles than that magazine does.

this newspaper’s reporters are better writers than that magazine.

our school newspaper is produced more frequently than is the middle school newspaper.

the survey reports that newspaper journalists have less job satisfaction than other journalists.

An example of illogical comparison is "This newspaper's reporters are better writers than that magazine".

When comparing, to make it logically, we have to deal with two things of the same category. Otherwise, it does not make sense or it is difficult to understand the reasoning.

For example, in the second option, newspaper reporters are compared with magazines (two things of a different type).

Instead, in the rest of the options, we compare magazine/magazine, school newspaper/school newspaper, and journalists/journalists (logical comparison).