Which one of the following sentences contains no errors?

a. management is offering overtime compensation for anyone whose willing to stay late to answer the phones.
b. office technicians are expected to communicate tactfully with frustrated individuals in order to minimmize tension in the workplace.
c. problem solving and collaberation are essential skills to have as an office technician.
d. depending on your departmental policy, overtime compensation can be in the form of leave credits or cash.