The manufactured crystals have to be pure
A
because natural quartz is pure
B
to maintain hygiene in factory work
C
to satisfy the precise needs of importers
D
to satisfy the exact requirements of science
E
otherwise they would take 3 million years to grow.
Verified Correct Answer: D.
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #14864)