Securities Premium Reserve is debited at forfeiture only when the premium was not actually received from the shareholder. The premium here was payable on allotment.
Sharma (100 shares) did not pay allotment, so premium was not received. Premium A/c must be reversed for 100 shares.
Verma paid his allotment in full (only call unpaid), so premium is already received and is not reversed.
Hence SPR is debited for 100 shares.