What's the easiest 1st instrument to learn?

[AlaskaMonty]

My DS has just started secondary school and a letter for music lessons has come out. He'd really like to learn something. He has narrowed it down to:
Drums
Guitar
Piano
Violin

He has asked which the easiest to start with would be, he can't read music, etc. I'm thinking piano as I see lots of little children be able to play that well?
Mind you, violin seems good as there are orchestras, etc.

drums - great if you are rhythmical but not all that much good as a general rule for orchestras

Well if you're learning drums, you are learning snare technique and will also be able to pick up a simple timpani part quite easily.... so drummers do end up in the school orchestras on base drum, snare, timpani, triangle, tambourine, etc etc all the time.

The nice thing about piano is that it sounds in tune from the beginning, even if you're playing Twinke Twinkle

I'd go for piano unless he's badly co-ordinated. I played it and DD has just started. DS played for a year or so but really struggled playing both hands and didn't like reading music. He's got a very good sense of rhythm so loves the drums which he now plays.

Another DD played the violin and if I never hear one in my house again, that's absolutely fine! If your DS wants to play an orchestral instrument though, that's the way to go.

None on that list!

Alto sax and/or clarinet. Practically the same fingerings music etc.

Taught myself alto sax as I could play the clarinet.
Both 'easy' to learn and sound good straight away.
Violin and guitar do not!