The answer is increasing information-processing capability.
This option is correct. Managers can cope with high uncertainty and heavy information demands by enhancing their ability to process information. This can be achieved through better information systems, improved communication channels, and more efficient data analysis tools, which help in making informed decisions quickly.
Creating interdependent tasks does not directly address the need to manage high uncertainty or heavy information demands. Instead, it might increase complexity and the need for coordination, which could exacerbate information demands.
Reducing resources is generally counterproductive when dealing with high uncertainty and information demands. It can limit a manager's ability to gather and process necessary information, thus hindering effective decision-making.
Cutting spending on information systems would likely decrease a manager's ability to process information efficiently, which is contrary to what is needed to cope with high uncertainty and information demands.
Limiting horizontal relationships can reduce the flow of information across an organization, which is not advisable when trying to manage high uncertainty and information demands. Horizontal relationships often facilitate better communication and information sharing.