(R)-Carvone is monoterpene responsible for the smell of spearmint. Considering the fact that (R)-carvone rotates the plane-polarized light in the counter-clockwise direction, answer the following questions:
(a) Should (R)-carvone be referred to as (d) or (l)?
(b) Should it be referred to as (+) or (−)?
(c) What would be the direction of rotation (d or l; + or −) for (S)-carvone?

• A. (a) (R)-Carvone should be referred to as (l).(b) (R)-Carvone should be referred to as (−).(c) (S)-Carvone should be referred to as (d) and (+).
• B. (a) (R)-Carvone should be referred to as (d).(b) (R)-Carvone should be referred to as (−).(c) (S)-Carvone should be referred to as (l) and (+).
• C. (a) (R)-Carvone should be referred to as (d).(b) (R)-Carvone should be referred to as (+).(c) (S)-Carvone should be referred to as (l) and (−).
• D. (a) (R)-Carvone should be referred to as (d).(b) (R)-Carvone should be referred to as (+).(c) (S)-Carvone should be referred to as (d) and (+).