An organic compound with the molecular of C₄H₈O has the isomers
(i) butanal (ii) cyclobutanol (iii) cyclobutanone (iv) 2 - methylpropanal

• A.(i) and (ii)
• B.(i), (ii) and (iv)
• C.(i), (ii) and (iii)
• D.(ii) and (iv)