Plz help me sir maam

Dear Student,
Current in a conductor is determined by its drift velocity only. According to Drude's model, it is defined by the relation:
$$\begin{gathered} I=neA{v}_d \\ where, \\ n=electron density \\ e=charge of an electron \\ A = area of the conductor \\ {v}_d= drift velocity of the electron \end{gathered}$$
Drift velocity of electrons is directed along a particular direction along which the potential gradient exist while thermal velocity of an electron results due to temperature and has no defined direction.
Hence, option (a) is the answer.

Regards