Which of the following is a common explosive used in offensive engineering?

C4 is widely recognized as a common explosive used in offensive engineering due to its practicality and effectiveness. It is a plastic explosive that is easy to mold into different shapes, making it versatile for various applications such as demolition, breach tactics, and military operations. C4 is stable, has a high velocity of detonation, and can be detonated using a variety of methods, which contributes to its popularity among engineers in offensive roles.

While other explosives like TNT, dynamite, and gunpowder have their own uses, they might not have the same level of versatility or safety in the context of modern offensive engineering. TNT is more traditional and has been widely used; however, it is not as flexible as C4. Dynamite is effective but also has stability issues under certain conditions. Gunpowder, while historically significant, is generally less effective for engineering purposes compared to more modern explosives like C4. This focus on safety, effectiveness, and versatility makes C4 the preferred choice in many offensive engineering scenarios.