The reason that cost management is so difficult in project management is that?

You could use latest Project management software to keep the tracking all digital and accurate. It doesn't only save time from doing the tasks manually but also forces the managers to do things on time as they will have to report it into the software. 

The process of estimating, assigning, and regulating project expenses is known as cost management. The cost management method enables a company to forecast future expenditures and, therefore, decrease budget overruns. Cost estimates are developed during the project planning process and must be authorized before work begins.

Lack of accountability is the major reason why Project Managers overlook the cost while they are very particular about the task and schedule. A smart Project Manager will plan his activities in such a way that both are taken care suitably.

Hi, 

The reason that cost management is so difficult in project management

1: Unplanned Costs

So many things can happen between the time a contract is signed and when it is finally executed. And they can all influence the cost of materials, equipment and labor and overhead, such as administrative, finance and legal costs. Unplanned costs – whether they are unexpected or overlooked – can bedevil any project.

This can happen among any two people involved in a project, but the miscommunication that could end up costing you money is most likely to take place between the project manager and another employee in a key role.

It’s a rare project that gets smaller over time; a project almost always grows, and with that growth, the costs. Many people defend “scope creep,” saying that it should be expected, as a project begins to take shape.

It’s more likely to happen with big, expensive projects – the type with hidden “surprises” that haven’t been unearthed yet, like building projects that involve excavation work. But underestimation can impugn smaller projects, t

I believe there are several platforms that project managers can use to identify tasks and assignments. If I had to choose an option, I would go with (C) because projects are quite intricate and there is not a "one size fits all" template that guarantees success and completion. It's the responsibility of the project manager to see how platforms such as ASANA  can be utilized effectively to ensure success and efficiency.