Select alkenes and alkynes from the following:
$C_{2}H_{4}, C_{3}H_{4}, C_{2}H_{2}, C_{4}H_{8}$

• A
  $C_{2}H_{4}, C_{4}H_{8}$ are alkenes; $C_{3}H_{4}, C_{2}H_{2}$ are alkynes
• B
  $C_{2}H_{4}, C_{2}H_{2}$ are alkenes; $C_{3}H_{4}, C_{4}H_{8}$ are alkynes
• C
  $C_{3}H_{4}, C_{4}H_{8}$ are alkenes; $C_{2}H_{4}, C_{2}H_{2}$ are alkynes
• D
  $C_{2}H_{2}, C_{4}H_{8}$ are alkenes; $C_{2}H_{4}, C_{3}H_{4}$ are alkynes