Answer:
The statements that are true are: B, C and D.
Explanation:
In the United States, candidates that run for Senators are not forced to serve at least two terms, thay are allowed to re run without any limitations (option A - false).
Regarding conditions of elegibility, Senators must be minimum 30 years old whenever elected for the position, whereas Representatives need to meet the minimum of 25 years old at that moment (option B - true).
Another requirement establishes that those who run for Senator must have been a USA citizen at least nine years before the election, while for becoming a member of the House of Representatives the minimum is being a citizen for seven years (option C - true).
Last point, both candidates for Senators and Representatives alike need to live and have residency in the state they represent (option D - true).
Source: <<https://www.senate.gov/artandhistory/history/common/briefing/Constitutional_Qualifications_Senators.htm>>
<<https://ballotpedia.org/United_States_House_of_Representatives#Representatives>>