A benchmark has been established at the soffit of an ornamental arch at known elevation of 100.0 m above mean sea level. The back sight used to establish height of instrument is an inverted staff reading 2.105m. A forward sight-reading with normally held staff of 1.105m is taken on recently constructed plinth. The elevation of plinth is

A

103.21m

B

101.00mm

C

99.00m

D

96.79m