A project manager and key team members were preparing a RACI chart for the major project work packages and activities. In each row they only assigned one $"$A$"($for Accountable$)$ to a single resource. Why did they feel it was necessary for only one person to be assigned the primary accountability for each activity?

a$.$ Because only one person should do the work on each activity or work package

b$.$ Because the project manager is always the person who is accountable for each activity or work package

c$.$ Because if more than one person has accountability, it is too easy for them to blame each other when something goes wrong

d$.$ Because there are rarely enough people on a project team to have more than one person be accountable