QUESTION 16 Equation y = a(1- e !) approximately describes the hardening of concrete, where is the compressive strength in megapascal (MPa), t-days after pouring. Using values of a=28.0 and n=0.0696 per in the equation, find the compressive strength after 14 days. Round your answer to 3 significant digits. O A. 15.7 MPa O B. 17.1 MPa O C. 17 4 MPa O D. 18.2 MPa