The 
matrix is a sparse
matrix because :
bus incidence matrix is a sparse matrix
Y primitive is a
sparse matrix
lines are connected to less no. of buses
no of lines are less
lines are connected to less no. of buses
A 
matrix in load flow
analysis is a sparse matrix.
admittance connected to the 
bus.
Total admittance between 
bus or interconnected bus.
Therefore, 
matrix shows sparsity, because lines are connected to less number of busses.
Hence, the correct option is (C).
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