The correct options are
B They are not compensated at any point in their employment.
C They do no get a hike in their salaries.
D They do not have any benefits like medical insurance or provident funds.
Contract and casual labourers face many issues, unlike permanent employees. They do not get a hike in their salaries. They are also not provided with any benefits like medical insurance and provident funds. In the case of termination or injury, they do not receive any compensation.