All indo-european languages have clearly defined:

parts of speech or
importance of word order

All Indo European languages have clearly defined parts of speech

Option 1

Explanation:

Usually parts of speech are made up of components like verb, noun, pronoun, adverb, conjunction, interjection, articles, determiner etc. Being one of the largest and the category to bring in a lot of languages under its umbrella.

A lot of Indo European languages have owned such sentence components, except Latin and a handful of Slavic languages like Polish, Czech, and Bulgarian etc.

There are some languages which go beyond the Indo European list of languages like Finnish and Hungarian and they have an interesting part of speech called post-position.

d. cassius cannot believe that a weakling like caesar has become so great.

one is a red flower, and one is the sky when the sun sets.