The Makkan forces were not successful at the battle of Khandaq because they
- ran out of supplies
-
were not familiar with the strategy of the Muslims
- were not properly coordinated
- were afraid of another defeat
The correct answer is: B
Explanation
The battle of khandaq was a battle of wits, the Muslims were out numbered but they used a defensive strategy of digging a trench(khandaq) which was used to trap most of the Arab. The siege was a "battle of wits", in which the Muslims tactically overcame their opponents while suffering very few casualties. Efforts to defeat the Muslims failed, and Islam became influential in the region. As a consequence, the Muslim army besieged the area of the Banu Qurayza tribe , leading to their surrender.
The defeat caused the Meccans to lose their trade and much of their prestige.