Sentence:  Under P. L. 113 , 78 th Congress , the Federal Government assumed <WSD>responsibility</WSD> for 100 % of necessary State expenditures in connection with administration and the counseling and placement of the disabled , and for 50 % of the necessary costs of providing clients with rehabilitation case services . 
Meaning of the word marked with <WSD> tags:  the proper sphere or extent of your activities