Given:
The given term is 3x.
To find:
The like terms.
Solution:
Like terms are the terms which contain same variable and degree.
In the given term 3x, the variable is x and its degree is 1.
The variable in 4y is y and, 8 and 0.257 are constant. So, 4y, 8, 0.257 and 3x are not like terms.
On 10 has variable x and degree 1. So, 3x and 10x are like terms.
Therefore, the correct option is B.