Which of the following molecules/species exhibit optical activity

• The substance that has the ability to rotate the plane of polarization light that is passed through it is called optical activity. 
• Optical activity is generally shown by the molecules/compounds that are chiral. Chiral molecules can rotate the plane polarized light in different directions and hence, are said to be optically active. Thus, from the given compounds, all of them tend to show chirality and hence exhibit optical activity.

Therefore, option (A) is correct.