Which of the following transactions would contribute to a increase of Chinese international investment position? ( )

A、AChinesefirmhaveinvestedinAmericanmanufacture,withthevalueoftheirinvestmentscurrently$30million.
B、TheChinesegovernmentsellsa$100millionofgoldand$200millionofAmericangovernmentbonds
C、Aforeigncompanyown$20millionofbondsissuedbytheChinesefirm.
D、AJapanesepensionfundbuy$30millionofbondsissuedbytheChinesegovernment.