Change. 00025 to scientific notation

Question 2 options:

A)

250 u

B)

none of these

C)

Two of these are correct

D)

250,000 n

After you realize that

0.00025 = 2.5·10^-4

= 250·10^-6 or 250 μ

= 250,000·10^-9 or 250,000 n

then it becomes a matter of semantics. Both A and D are correct representations, so choice B is incorrect.

Choice C present a dilemma. If you say it is correct, then there are 3 correct choices (A, C, D), not two, so C is incorrect.

If you say it is incorrect, then there are two correct answers (A, D), making choice C correct.

I'd probably choose C and try to avoid the argument with my teacher.