The correct answer is A) He was not happy that the United States maintained possession of the Philippines following the Spanish-American War.
The Philippines were under Spanish rule. In 1892, a man named Andres Bonifacio founded a resistance group called the Katipunan ('Highest and Most Respectable Society of the Sons of the People'), dedicated to driving the Spaniards from the islands but he was executed by the authorities later.
After that, Aguinaldo took the leadership of the revolution against Spain. In 1897 Aguinaldo accepted a substantial bribe from Spain to remove himself to Hong Kong, but he returned in May 1898, with Admiral Dewey's assistance, to help the Americans defeat the Spaniards. He took several provincial towns and proclaimed the independence of the Philippines at a ceremony on June 12th, now Philippine Independence Day.
Aguinaldo thought that the Americans would leave the Philippines but they didn’t. In December, Spain ceded the Philippines to the United States.
On the night of February 4th, an American patrol shot a Filipino guerrilla on a bridge at San Juan. General fighting broke out and the Filipino fighters resisted bravely, though their leaders had all gone casually off home for the weekend. Aguinaldo tried to stop the fighting, but the Americans pressed on, the nationalists resumed their guerrilla tactics and the conflict dragged on for three years.
Aguinaldo was captured in 1901 at a secret headquarters in northern Luzon and soon swore allegiance to the American regime. He was rewarded with a US government pension and retired from view until 1935, when he ran for president of the Philippines and lost.
When the Japanese invaded the Philippines in 1941, they found Aguinaldo handy as an anti-American figurehead. When the Americans returned he was arrested as a collaborator and briefly imprisoned; he was then in his seventies. He finally died in Manila in 1964, at the age of ninety-four.