B is an individual citizen and resident of Brazil. His start up company negotiates cooperation with a U.S. corporation which requires him to visit the U.S. shall he become a U.S. resident in 2010 in the following cases?

A. He spent the first three months of 2008-2010 in the U.S.

B. He spent 360 days in the U.S. in each of 2008 and 2009, and the whole month of June in 2010.

C. He spent 20 days in the U.S. in each of 2008 and 2009. What is the maximum number of days he can stay in the U.S. in 2010?