The correct options are
B −273.15∘C
C Molecular motion ceases
D 0 K
The absolute zero is defined as 0 K on the Kelvin scale. It is the temperature at which molecular motion ceases. Hence, matter ceases to exist. Using temperature scale conversions,
C=K−273.15
C=−273.15
Hence, 0 K=−273.15∘C