The compound which gives the most stable carbonium ion on dehydration is

\displaystyle{\left.\begin{array}{c} {C}{H}_{{{3}}}-{C}{H}-{C}{H}_{{{2}}}{O}{H}\\\ \text{ |}\\\ \text{ }\ {C}{H}_{{{3}}}\end{array}\right.}

\displaystyle{\left.\begin{array}{c} \ \text{ }\ {C}{H}_{{{3}}}\\\ \text{ |}\\{C}{H}_{{{3}}}-{C}-{O}{H}\\\ \text{ |}\\\ \text{ }\ {C}{H}_{{{3}}}\end{array}\right.}

\displaystyle{\left.\begin{array}{c} \ \text{ }\ {O}{H}\\\ \text{ |}\\{C}{H}_{{{3}}}-{C}{H}-{C}{H}_{{{2}}}-{C}{H}_{{{3}}}\end{array}\right.}