Give the cal wavelength max of the structure above according to Woodward's rules?​

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

0.09 moles of sodium sulfate in 12 ml of solution

Ab c or d ? i’m not sure what the answer is