The enantiomeric pair among the following four structures is:

(I) 

(II) 

(III) 

(IV) 

Two possible stereoisomers for

are:

Given the structure of $\mathrm{D}-(+)$ -glucose as

 The structure of $\mathrm{L}-(-)$ glucose is

Which of the following alkenes can generate optically active compounds upon hydrogenation?