The correct option is
C 22L35COM of each brick is at L2.
Hence, according to their positions the COM of each brick is shown in the figure below. Now, using the expression of com for multiple particles. By symmetry, y-coordinate of com will not displace.Therefore,
Xcom=m1x1+m2x2+……m7x7m1+m2+……m7
=2m.L2+2m.6L10+2m.7L10+8L107m
=44L70=22L35.