This is one of the best observation i have come across this website
2017 ke baad se optionals have been made really tough
Not a single day goes by when I don’t think of this fact
E.g. lets look at criminology paper of 2016: defin criminal, types of criminals? Define Probation and discuss conditions for probation?

A breif look in Criminology 2019 paper will show how far the difficulty level has been raised

I will once again thank the writer for pointing out the crux of css optionals: since 2017 the optionals have been made more analytical (I personally think this reduces the chances of getting a high score in optionals but this is just a personal opinion:
Case in Points can be the overall decline in scores of Gender Studies, even the two toppers of css-2018 scored in 55-61 range

Let’s see how scores for css-2019 gender studies go

So sum up; the following optionals had a detrimental result since 2017:

1. 2017: International Relations
2. 2018: History of U.S.A

Only time will tell what happens in 2019 css result. We can only hope that optionals go back to being generally high scoring