Answer: The correct answer is "the wavelength will get shorter".
Explanation:
Red shift: In red shift, Light changes as the object in space (such as galaxies or stars) moves away from us then the light is shifted to red end. In this case, the light is shifted to longer wavelength.
Blue shift: In blue shift, Light changes as the object in space (such as galaxies or stars) moves towards from us then the light is shifted to blue end. In this case, the light is shifted to shorter wavelength.
In the given problem, the object moves towards us, then the wavelength of the object gets shorter.
