An apparatus setup is used to demonstrate double-slit interference with monochromatic light. The slit separation is $0.10\,\text{mm}$. The distance from the double slit to the screen on which the interference pattern is seen is $2.4\,\text{m}$, and the fringe width is $12\,\text{mm}$. The screen distance is then altered to $1.8\,\text{m}$ and the slit separation is doubled. What is the new fringe width?
- A$1.5\,\text{mm}$
- B$4.5\,\text{mm}$
- C$6.0\,\text{mm}$
- D$9.0\,\text{mm}$