Alkenes

Allene is the name given to propdiene,

Hybridisation of an atom is determined by determining the number of hybrid orbitals at that atom which is equal to the number of sigma bonds plus number of lone pairs at the concerned atom.
Pi bonds are not formed by hybrid orbitals, therefore, not counted for hybridisation.
Here, the terminal carbons have only three sigma bonds associated with them, therefore, hybridisation of terminal carbons is . The central carbon has only two sigma bonds associated, hence hybridisation at central carbon is sp.

So, the correct answer is (B): sp and sp²