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

Answer: 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.