When a sample of gas is compressed at constant temperature from $15 \, atm$ to $60 \, atm$,its volume changes from $76 \, cm^3$ to $20.5 \, cm^3$. Which of the following statements are possible explanations of this behaviour?
$(1)$ The gas behaves non-ideally
$(2)$ The gas dimerises
$(3)$ The gas is adsorbed into the vessel walls

• A
  $1, 2, \text{ and } 3$
• B
  $1 \text{ and } 2 \text{ only}$
• C
  $2 \text{ and } 3 \text{ only}$
• D
  $1 \text{ only}$