The correct option is
C means
We can say that the bicycle is a 'way' or 'tool' of transport. Thus, the answer must mean 'way' or 'tool'.
Option A is incorrect. Type does not mean 'way' or 'tool'. Thus it is incorrect.
Option B is correct. 'Means' in this context means 'way'. Thus, it is the best fit for the blank.
Option C is incorrect. Kind has the same meaning as option A. Thus, it is not a good fit either.
Option D is incorrect. Variety means 'form' and not 'way or 'tool'. Thus, it does not fit in the blank.
Here, we can also notice that options A, C and D have the same meaning. Since all three options cannot be correct, all of them must be incorrect. Thus, making option B automatically correct.