Red light can have a wavelength of 706 nm which means 0.000000706 meters. Which is closet to the frequency of red light if light travels at 300,000,000 m/s?

"if the pressure acting on an ideal gas at constant temperature is tripled, its volume isa) reduced to one-third.b) increased by a factor of three.c) increased by a factor of two.d) reduced to one-half"