VIGHNESHKAMATH
Hello Team,
I would like to know the role played by ''that of '' in the non-underlined portion of the sentence. I understand that is acting as a demonstrative pronoun, thus ''that'' should modify the logical antecedent of GNP. However, the antecedent for ''that'' can grammatically only be ''eleventh largest GNP''. And that would make the meaning illogical. How, then the OA is correct? How ''that'' is conveniently able to modify only the GNP and not the entire noun phrase: ''eleventh largest (adjective)+ GNP (noun)''?
Would be helpful if some can resolve this doubt.
Regards
Vighnesh Kamath
Let's start with a simpler example of "that of" (the OA from
this official question):
"The population of Japan is shrinking faster than that of any other nation and is projected to decline by 17 percent during the next half century."
The meaning here is pretty obvious: "The population of Japan is shrinking faster than
the population of any other nation..."
But wait a minute: how did we know to replace "that" with just "population" and not with the entire noun phrase ("population
of Japan")? Well, because the structure and context of the sentence made it clear that we were comparing the population of one place to the population of some other place(s). Also, comparing (1)
the population of Japan to (2)
the population of Japan of any other nation doesn't make any sense at all.
Is it grammatically possible for "that" to refer to "population of Japan"? Sure. But if the structure and context suggest a perfectly logical comparison and you have to do a lot of work to make it illogical, then the pronoun is probably okay. The same is true in choice (C).

I hope that helps!