In his effort to reform the civil service, President Hayes appointed a special committee charged with drawing up new rules for federal appointments.

collaborated with Chester Arthur to reform the Port of New York.

convinced Congress to outlaw the spoils system during his presidency.

signed the Pendleton Act of 1883 into law, effectively ending the spoils system.

Should be A.

Explanation:

B is not true, they did not work together, in fact, Hayes demanded his resignation.

C is not true, he failed in convincing Congress.

D is not true, that was signed by Pres. Arthur, not Hayes.

Hope this helped.

b) race riots in several cities

the berlin blockade was an international crisis that arose from an attempt by the soviet union, in 1948–49, to force the western allied powers (the united states, the united kingdom, and france) to abandon their post-world war ii jurisdictions in west berlin. in march 1948 the allied powers decided to unite their different occupation zones of germany into a single economic unit. in protest, the soviet representative withdrew from the allied control council. coincident with the introduction of a new deutsche mark in west berlin (as throughout west germany), which the soviets regarded as a violation of agreements with the allies, the soviet occupation forces in eastern germany began a blockade of all rail, road, and water communications between berlin and the west. on june 24 the soviets announced that the four-power administration of berlin had ceased and that the allies no longer had any rights there.