Which of the following alkenes is the most stable?

Rank the following alkenes in order of increasing $\lambda_{max}$:
$(1)$ $A$ conjugated diene in a bicyclic system.
$(2)$ An isolated diene in a bicyclic system.
$(3)$ $A$ conjugated diene in a bicyclic system (different substitution pattern).

${\text{Glycerol}}$ $\xrightarrow{KHSO_4} (A)$ $\xrightarrow{LiAlH_4} (B)$; $(A)$ and $(B)$ are respectively:

The products $A$ and $B$ formed in the following set of reactions are:

$CH_3-C(CH_3)(Br)-CH(CH_3)_2 \xrightarrow[\Delta]{EtOH} (A)$
Major product $(A)$ is

Cyclohexene on oxidation with $KMnO_4$ in dil. $H_2SO_4$ forms.