D IS THE ANSWER TO YOUR QUESTION
Answer:
my teacher would let u say the density to mass is the ratio but i think everyone's different
Answer: The de broglie wavelength is
.
Explanation:
Calculate
as follows.

where,
h = plank's constant = 
p = momentum = 
Putting the values in the formula as follows.

=
= 
Thus, the de broglie wavelength is
.