Select the correct option:
$(1)$ $C_4$ plants have double the efficiency of carbon fixation compared to $C_3$ plants.
$(2)$ Sugar is transported from source to sink through the $\text{phloem}$ / $\text{xylem}$ tissue.

• A
  $(1)$ $C_4$ plants,$(2)$ $\text{phloem}$
• B
  $(1)$ $C_3$ plants,$(2)$ $\text{xylem}$
• C
  $(1)$ $C_4$ plants,$(2)$ $\text{xylem}$
• D
  $(1)$ $C_3$ plants,$(2)$ $\text{phloem}$