The correct option is
B False
Deuterium (1H2 or D) is not an isomer of protium. It is
is a isotope of hydrogen, there isotopes (protium, 1H1,
deuterium, H2 and tritium, H3 ) differ from one
another in respect of the presence of neutrons.
Deuterium is also known as heavy hydrogen.
It's preparation: - from heavy water. It is possible to get
deuterium by decomposing it with sodium, red hot
iron or tungsten or by it's electrolysis containing
sodium carbonate.