A. 9.0 x 10^1 cm^2
B. 9.000 x 10^1 cm^2
C. 9 x 10^1 cm^2
D. 9.00 x 10^1 cm^2
I have been asked this question in class test.
Question is taken from Signifiant Figures topic in chapter Introductory Concepts of Chemical Process Calculation
For explanation: The measurement with the least number of significant digits determines the number of significant digits in the quotient.