In general, when a number written in scientific notation includes a positive exponent, the magnitude of the number is a. negative b. positive c. less than one d. greater than one

When a number written in scientific notation, it includes a positive exponent, the magnitude of the number is greater than one.

Lets try it

9 times 10^2
that is 900
900>1

D is answer
it is greater than 1 generally
now if we had -9 times 10^2, that would be -900 so A could also be true

either A or D
I would go wit D