A polynomial is considered to be in standard form when its terms are arranged in descending order of their degrees (the powers of the variable).
Let's analyze each option:
A.
Terms are arranged as (1) (degree 0), (-2x) (degree 1), and () (degree 4).
Not in standard form (highest degree term is last).
B.
Terms are arranged as (-2x) (degree 1), () (degree 4), and (1) (degree 0).
Not in standard form (highest degree term is second).
C.