I need help please !

To develop strategies to manage water quality in polluted lakes, biologists must determine the depths of sediments D(1) and the rate of sedimentation. It has been determined that the depth of sediment (in centimeters) with respect to time (in years before 1990) for a lake can be estimated by the equation D(1) = 153 (1 - e -0.01371). a. Find D(20) and interpret b. Find lim D(t) and interpret 1-+ 00 a. Find D(20). D(20) = 36.7 (Round to one decimal place as needed.) Interpret D(20). Select the correct choice below and fill in the answer box within your choice. O A. The depth of the sediment of the lake in 2010 is cm. (Round to one decimal place as needed.) O B. The depth of the sediment of the lake in is 20 cm. (Round to the nearest year as needed.) O C. The depth of the sediment of the lake in 1970 is cm. (Round to one decimal place as needed.)