The prop-1-en-2-yl cation $\mathrm{CH}{}_3-\mathrm{C}{}^{+}=\mathrm{CH}{}_2$ (a vinyl cation) has the cationic carbon which is:

1. A$sp$ hybridised, with a linear arrangement of the $\mathrm{C}-\mathrm{C}{}^{+}=\mathrm{C}$ unit
2. B$s{p}^2$ hybridised and trigonal planar
3. C$s{p}^3$ hybridised and pyramidal
4. D$s{p}^{3}d$ hybridised