OLD CLOCK TOWERBuiltMDCCLXXXIVRestoredMCMLIIA168B268C178D158 Step-by-Step SolutionMDCCLXXXIV =1000+700+80+4=1784. MCMLII =1000+900+50+2=1952. Gap =1952−1784=168 years.Answer: A) 168