American method of tunneling________________?_x005F_x000D_i) is suitable for large sized tunnels_x005F_x000D_ii) is no,’ suitable for railway or highway tunnel’s_x005F_x000D_iii) requires heavy timbers_x005F_x000D_select the correct answer?

• A. only (i) is correct
• B. (i) and (iii) are correct
• C. (ii) and (iii) are correct
• D. (i) and (ii) are correct