Awesome question, PBW, and one that has me conflicted...while I certainly agree with ST about the different themes contained in "Imagine", I disagree kinda about "All You Need Is Love".
There's nothing you can do that can't be done.
Nothing you can sing that can't be sung.
Nothing you can say but you can learn how to play the game
There seems to be a sort of fatalism in that lyric, like a person has no real say in one's destiny, and that continues throughout the song...but the chorus is what really drives the song:
All you need is love, all you need is love,
All you need is love, love, love is all you need.
Love, love, love, love, love, love, love, love, love.
All you need is love, all you need is love,
All you need is love, love, love is all you need.
That says a lot.
However, I think I'm going to be a maverick here and go with 'A'. The lyrics are straight on point:
Say the word and you'll be free
Say the word and be like me
Say the word I'm thinking of
Have you heard the word is love?
It's so fine, It's sunshine
It's the word, love
In the beginning I misunderstood
But now I've got it, the word is good
Spread the word and you'll be free
Spread the word and be like me
Spread the word I'm thinking of
Have you heard the word is love?
It's so fine, It's sunshine
It's the word, love
Everywhere I go I hear it said
In the good and the bad books that I have read
Say the word and you'll be free
Say the word and be like me
Say the word I'm thinking of
Have you heard the word is love?
It's so fine, It's sunshine
It's the word, love
Now that I know what I feel must be right
I'm here to show everybody the light
Give the word a chance to say
That the word is just the way
It's the word I'm thinking of
And the only word is love
It's so fine, It's sunshine
It's the word, love
On top of that, it has some tasty bass from Macca!