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The voltage ranges for a logic high and a logic low in RS-$232$ C standard is

  1. Low is $0.0 V$ to $1.8 V$,  High is $2.0 V$ to $5.0 V$
  2. Low is $-15.0 V$ to $-3.0 V$,  High is $3.0 V$ to $15.0 V$
  3. Low is $3.0 V$ to $15.0 V$,  High is $-3.0 V$ to $-15.0 V$
  4. Low is $2.0 V$ to $5.0 V$,  High is $0.0 V$ to $1.8 V$

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ans is (c)

The RS-232 standard defines the voltage levels that correspond to logical one and logical zero levels for the data transmission and the control signal lines. Valid signals are either in the range of +3 to +15 volts or the range −3 to −15 volts

https://en.wikipedia.org/wiki/RS-232

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