If I ain't mistaken its C. I shall be all that I am and more.
Broadest being American poetry of the early twentieth century, poetry of the 1920's Harlem Renaissance movement, Langston Hughes's poetry during the Harlem Renaissance movement, and the narrowest being Langston's poem "The Weary Blue's"
Yes, you are correct. Though, they all make sense and mean the same thing, but B is the best choice.
Even though the wave speed is calculated by multiplying wavelength by frequency, an alteration in wavelength does not affect wave speed. Rather, an alteration in wavelength affects the frequency in an inverse manner. A doubling of the wavelength results in a halving of the frequency; yet the wave speed is not changed.
hope this helps you
