Answer:
The correct option is c.
Step-by-step explanation:
The given expression is
[tex]6c^2+2.5d-d+2c^2-3d[/tex]
Like terms are those terms which have same variable having same degree.
On combining like terms we get
[tex](6c^2+2c^2)+(2.5d-d-3d)[/tex]
On simplification we get
[tex](8c^2)+(-1.5d)[/tex]
[tex]8c^2-1.5d[/tex]
The simplest form of given expression is [tex]8c^2-1.5d[/tex].
Therefore the correct option is c.
