If frequency stays the same what happens to wavelength when wave speed is increased? HELP ASAP

If wavelength changes due to a change in the medium through which it travels, that affects only the wavelength, not the frequency. With frequency remaining constant and the wavelength increasing, then velocity increases. With frequency remaining constant and wavelength decreasing, velocity decreases.

Explanation:

thinking it would be d not too sure but i think it's right

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: