You should rewrite those IF statements to be nested. Also, it's recommended to use logic gates instead of comparison operators, as well as using the button constants instead of their value, when writing conditionals using BUTTON.
Another good practice is to map the actions of each option.
Example:
VAR ACTION$[3]
COPY ACTION$,@MAP
IF B AND #UP THEN SELECTION=MAX(0,SELECTION-1)
IF B AND #DOWN THEN SELECTION=MIN(2,SELECTION+1)
IF B AND #A then CALL ACTION$[SELECTION]
DEF option1
? "You picked the first option"
END
@MAP
DATA "option1","option2","option3"
