However, the group’s long term strategy is to . . . . . . . on core sector businesses connected with infrastructure and energy.

The correct answer is: concentrate.

The word “concentrate” means to focus one’s attention or efforts on a particular thing. In this case, the group’s long-term strategy is to focus on core sector businesses connected with infrastructure and energy.

The other options are not as relevant to the context of the question. The word “depend” means to rely on something or someone. The word “breed” means to produce offspring. The word “develop” means to grow or expand.

In conclusion, the correct answer is: concentrate.