Overall Grade $($Highest Attempt$)\frac{2}{3}-66\mathrm{.}67\%$

Question $1$

$\frac{0}{1}$ point

A converging lens with a focal length $30$ cm is forming a virtual image, $3\mathrm{.}0$ times as large as the object. How far from the lens is the object?

a$)60$ cm

b$)10$ cm

c$)45$ cm

d$)15$ cm

e$)40$ cm

f$)90$ cm

g$)20$ cm

I want to know which one is the correct answer because $40$ was not correct either.