Central African Republic
Presently, the Central African Republic has active television services, radio stations, internet service providers, and mobile phone carriers; Socatel is the leading provider for both internet and mobile phone access throughout the country. The primary governmental regulating bodies of telecommunications are the Ministère des Postes and Télécommunications et des Nouvelles Technologies. In addition, the Central African Republic receives international support on telecommunication related operations from ITU Telecommunication Development Sector (ITU-D) within the International Telecommunication Union to improve infrastructure.

Q: Who assists CAR with telecommunications?
ITU Telecommunication Development Sector
In the given context, it is mentioned that CAR receives international support on telecommunication related operations from ITU Telecommunication Development Sector (ITU-D) within the International Telecommunication Union. Therefore, it can be inferred that ITU Teletcomunication sector assists CAB with telecommunications.
Hence, we conclude: 
"ITU Telecommunications Development Sector"..