RIO DE JANEIRO Aug 28 Brazilian Senator Jose Serra said on Friday he expects a vote on changing the country's oil law to ease demands on state-run firm Petrobras and reduce local content rules to take place in September.
Refer to the input text as context and select the correct relationship between 'Petrobras' and 'RIO DE JANEIRO' from the available options.
Options: headquarters location, publisher, location of formation, member of