Solve. -The Voltage Across a Resistor Is Jointly Proportional to the the Resistance

Multiple Choice

Solve.
-The voltage across a resistor is jointly proportional to the resistance of the resistor and the current flowing through the resistor. If the voltage across a resistor is 21 volts for a resistor whose resistance is 3 ohms and when
The current flowing through the resistor is 7 amperes, find the voltage across a resistor whose resistance is
2 ohms and when the current flowing through the resistor is 4 amperes.

A) 12 volts
B) 28 volts
C) 8 volts
D) 14 volts