The journal entry for the amount due on allotment is:

The correct answer is Option (3) → Share Allotment A/c is debited and Share Capital A/c is credited

When the allotment money falls due, the shareholders owe it to the company. The amount is debited to the Share Allotment A/c, which shows what is receivable from them, and credited to the Share Capital A/c, because that part of the capital has now been called (and to Securities Premium where a premium is called with it). The cash is recorded later, when it is received: Bank A/c Dr., To Share Allotment A/c.

Share Allotment A/c     Dr.
    To Share Capital A/c