How Do Stereochemistry and Isomerism Interrelate in These Compounds?

[Gourab_chill]

Homework Statement

See the question below.

Relevant Equations

--no equations--

The answer to this question are the ones I've marked as shown above.
But I'm confused as to how?
The first option is okay since it has a chiral carbon with no plane or line of symmetry and shows geometric isomerism too.
In the third option, the compound shows Geometrical isomerism but i fail to find a chiral carbon- then how can it show optical isomerism?
And as for the last option, i can't make head or tail of how it shows geometrical isomerism.

 

[mjc123]

No.3: the chirality is about the ring-ring bond. The planes of the two rings are perpendicular, and the bulky ortho substituents prevent rotation about this bond. Because of the unsymmetrical substitution pattern, the two mirror-image arrangements can't be superimposed.
no.4: the two methyl groups may be cis or trans relative to each other.