Who is they in the following sentence?

The group grew tired of making these sentences because they are tedious.

OPTIONS:
- The group
- these sentences
these sentences
Vilka är de i följande mening? Gruppen tröttnade på att göra dessa meningar eftersom de är tråkiga. ALTERNATIV: - Gruppen - dessa meningar
Who are they in the following sentence? The group got tired of making these sentences because they're boring. ALTERNATIVE: - The group - these sentences
dessa meningar
these sentences