Please explain

You're in love, Charlie Brown! Prior to his meeting that little girl with the red hair, Charlie Brown's utility function was given by U(S,R) = 3S + R where S denotes sweets (at $4 per pound) and R denotes roses (at $2 per rose). Upon catching a first glimpse of his heartthrob, Charlie Brown's tastes change as does his utility function to LOVEU(S, R)= S + 3R. If Charlie Brown has budgeted $24 annually for sweets and roses, how many more roses will he buy after he goes gaga over the little redheaded girl? a. N D. 4 6 d. 12 None of the above