Consider the following statements and choose the correct answer:
1. The rate of respiration is directly proportional to the oxygen concentration in plants
2. Van't Hoff's coefficient is generally five (Q₁₀=5)
3. Generally in case of injured plant tissues the rate of respiration is increased for the time being
4. The rate of respiration is directly proportional to the respiratory substrate present in the tissues

A. Only 1, 2 and 3 are true

B. Only 2, 3 and 4 are true

C. Only 1, 3 and 4 are true

D. 1, 2, 3 and 4 are true

Answer: Option C