Answer:
Germanic languages
Explanation:
Indo-European languages are a family of languages spoken throughout Europe and Asia, with almost one half of world's population speaking a language from this group.
In order to identify this branch of Indo-European languages, let us first see where it is spoken.
It is given that it's spoken in Europe, more specific in its northern and western parts.
Europe's most spoken languages from Indo-European group are Germanic (North, West and parts of Middle Europe), Romance (West and South Europe) and Slavic (Middle and East Europe).
So, from this, we can conclude this branch of Indo-European languages is Germanic.