The description of amoeboid movement like spreading of a water drop on an uneven surface of a glass plate is :

Question

$\begin {array} {1 1} (1)\;Contraction \: theory & \quad (2)\;Adhesion\: theory \\ (3)\;Surface\: tension\: theory & \quad (4)\;Change \: of \: viscosity\: theory \end {array}$