The correct option is A Ringing experiment for translocation of sap
The experiment shows ringing experiment for translocation of sap. The phloem (bark) is removed, which is responsible for carbohydrates transportation from leaves to root level. Therefore, food will be stored on upper side. In second experiment, the xylem part is removed which is responsible for water transportation from roots to leaf level. In the absence of xylem, transportation of sap will be checked.
So, the correct answer is option 'a'.