Here you go I think they’re right
The first one is the correct answer because Apple it’s singular so manzana if you add manzanas mean more than one apple
A means juan and ana, do you sit here
B means juan and ana, let's sit here
C means juan and ana, sit here
D means juan and ana, let's sit here
And I believe it is C
Solíamos reírnos de neustros malas bromas.
Entoces crecimos
Y nunca se río de nuevo
.............
Hope it helps