Which One of the Following Is an Example of an Offensive

Which one of the following is an example of an offensive strategy?

A) blocking the avenues open to challengers
B) signaling challengers that retaliation is likely
C) pursuing continuous product innovation to draw sales and market share away from less innovative rivals
D) introducing new features or models to fill vacant niches in its overall product offering and better match the product offerings of key rivals
E) maintaining a war chest of cash and marketable securities