The correct answer is call together.
B. call together
The correct answer is (B) To call together (a committee, assembly, etc.); to assemble, especially a formal gathering, or cause to assemble; to convoke (assembly); to come together; often for a public purpose. Also, to summon to appear before a tribunal, etc.
Convene comes from Latin convenir, (com [together] + venir [to come]).
Examples of use:
- He convened the meeting on Monday.
- The committee convened after lunch.