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The correct option for connecting a modem to a standard telephone line is RJ-11. This connector is specifically designed for use with telephone lines and is typically used for analog phone connections. RJ-11 connectors are capable of handling two to four wires, which is sufficient for voice communication and basic data transmission over traditional phone lines.

RJ-45 is commonly used for Ethernet connections and is designed for networking purposes, which involves higher data speeds and different wiring configurations. USB connectors serve a multitude of purposes, primarily for connecting peripheral devices to computers or power sources, but are not suited for telephony. Coaxial cables are used mainly for cable television and internet connections that require bandwidth beyond what a normal telephone line can provide.

Understanding the function of each type of connector helps clarify why RJ-11 is the appropriate choice for modem and telephone line connections.