Hello Manish,

Among the given options, only Conjugated Dienes show transition of low energy due to Conjugation. For molecules having conjugated systems of electrons, the ground states and excited states of the electrons are closer in energy than for non-conjugated systems . This means that lower energy light is needed to excite electrons in conjugated systems .

I hope this information was helpful for you. You may ask if you have any further queries.

Have a good day!!