A signs a promissory note for ₹10,000 payable to B or order. Without A's consent, B alters the amount to ₹15,000 and indorses the note to C, who indorses it to D for value. D sues on the note. Who…

Section 87 of the Negotiable Instruments Act, 1881 makes a materially altered instrument void against any person who was a party to it when the alteration was made and did not consent, unless the alteration carried out the original parties' common intention. A was a party and did not consent, so he can resist payment. B made the alteration and C became a party only afterwards, so neither can rely on the section.