(A) 4
Explanation:
Degree of a polynomial = Highest power of the variable in a polynomial.
The highest power of variable x in the polynomial 4x4 + 0x3 + 0x5 + 5x + 7 is 4.
Therefore, degree of the polynomial of 4x4 + 0x3 + 0x5 + 5x + 7 = 4.
Hence, option A is the correct answer