I only know one and it is Robot
B, that is the only one that makes sense in this sentence. If the sentence was worded differently than it would be, C
A.) Worker's compensation is the kind of insurance that is required by law for a business with employees.
It is an insurance that provides for the wage replacement and medical benefits to injured employees who were injured in the course of doing their jobs.
D. Word of mouth is the best type of advertising for an early childhood program.
It is better to advertise through word of mouth because people believe said advertisement to be truthful and credible.
A(sight................................................................
