7. Male cockroaches with mutations that strongly decrease the
function of an RTK called RTKX are oblivious to the charms of their
female comrades. This particular RTK binds to a small molecule
secreted by sexually mature females. Most males carrying
loss-of-function mutations in the gene for Ras protein are also
unable to respond to females. You have just read a paper in which
the authors describe how they have screened cockroaches that are
mutant in RTKX for additional mutations that partly restore the
ability of males to respond to females. These mutations decrease
the function of a protein that the authors call Z. Which of the
following types of protein could Z be? Explain your answer.

(a) a protein that activates the Ras protein by causing Ras to
exchange GDP for GTP

(b) a protein that stimulates hydrolysis of GTP by the Ras
protein

(c) an adaptor protein that mediates the binding of the RTKX to
the Ras protein

(d) a transcriptional regulator required for the expression of
the Ras gene

(I think its B but I dont have a good explanation why its B and
im not 100% sure it is B. If it is B please explain why B is
correct and if it isnt please explain why that answer is correct
instead.)