Which sentence contains an essential adjective clause?

The sponsor who pays for our uniforms deserves advertising at each game.
Our sponsors, who fund the team, are invited to the opening game.
After explaining the sponsorship levels, they agreed to join at the silver level.
During halftime, the speaker announced the sponsors.

Question

Which sentence contains an essential adjective clause?

The sponsor who pays for our uniforms deserves advertising at each game.
Our sponsors, who fund the team, are invited to the opening game.
After explaining the sponsorship levels, they agreed to join at the silver level.
During halftime, the speaker announced the sponsors.

anonymous · Answer

what do you think it is

anonymous · Answer

I have no idea. thats why im asking