( left[ begin{array}{c c c r r r r}2 & -1 & 6 & 3 0 & 14 & 8 & 0 0 & 0 & 5 & 1 0 & 0 & 0 & 3 end{array} right] ) is a _____

( left[ begin{array}{c c c r r r r}2 & -1 & 6 & 3 0 & 14 & 8 & 0

1.	( left[ begin{array}{c c c r r r r} 2 & -1 & 6 & 3 0 & 14 & 8 & 0 0 & 0 & 5 & 1 0 & 0 & 0 & 3 end{array} right] ) is a _____
A.	Principle diagonal matrix
B.	Upper triangular matrix
C.	Lower triangular matrix
D.	Singular matrix
Answer» C. Lower triangular matrix