Need some help in getting my concepts clear with And. The question mentioned below is from Grockit.
Recently implemented "virtual lectures" conducted remotely at the request of college students have reduced test scores, grades, discussion among students, and have increased student retention of the material
A) discussion among students, and have increased
B) discussion among students, and increased
C) and discussion among students while increasing
D) lowered discussion among students, but increased
E) and discussion among students was reduced while increasing
OA - C
Here i am clear with the reasoning for C - Implementing virtual lectures has reduced test scores, grades, and discussion among students. However, it has increased retention of the material. For sentence clarity, the list of three elements that have been improved require "and" before the final element. Also, contrast is needed between these three negative effects and the one positive outcome (increased retention).
Problem: "while increasing" in the correct answer C, i dont think its parallel with the first line - "virtual lectures" reduced (i think it should be increased) but since its the best posssible option out of all so C might be correct. Its just that i want to be clear if my concepts are clear. How can i re-phrase the answer choice to make it perfect?
1. and discussion among students, and have increased
2. and discussion among students, but have increased
Is it ok the way i wrote in 1 and 2 above? Please explain?