13. Rate of the reaction: A→products is doubled when the concentration of A is incrcased four times. If the half-life of the reaction is 16 min, at a given concentration, then the time required for 75% of the reaction to complete is (A) 24.0 min, (B) 27.3 min, (C) 48.0 min, (D) 49.4 min, (E) 52.3 min.