# Balancing roots are seen in

$\begin {array} {1 1} (1)\;Dolichos & \quad (2)\;Pistia \\ (3)\;Piper & \quad (4)\;Vanda \end {array}$

Pistia is a genus of aquatic plant in the arum family, Araceae. The single species it comprises, Pistia stratiotes, is often called water cabbagewater lettuceNile cabbage, or shellflower. Its native distribution is uncertain, but probably pantropical; it was first discovered from the Nile near Lake Victoria in Africa. It is now present, either naturally or through human introduction, in nearly all tropical and subtropical fresh waterways. The genus name is derived from the Greek word πιστός (pistos), meaning "water," and refers to the aquatic nature of the plants.[4]  BY THIS GIVEN REASON WHERE PISTIA CAN BALANCE THE ROOTS

SO THE ANSWER IS OPTION 2 -  PISTIA