Which statement describes a resistor in a circuit?
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a. it forces positive charge to move against its natural tendency.
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b. it heats up by opposing the flow of charge through the circuit.
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c. it acts as a switch to control the flow of charge in a circuit.
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d. it stores charge on conductive plates in a circuit.

A resistor in a circuit acts as a switch to control the flow of charge in a circuit.

Explanation:

An electrical components that plays a role of limiting or regulating the electrical current flow is termed as Resistor. It can be helpful for the purpose of giving certain voltage to a device like a transistor. The current that is passing through a resistor has a inverse proportionality with its resistance and direct proportionality to the voltage that is passing across it., provided another factors remaining unchanged. This can be explained by  Ohm's Law.

The electric current that is passing through an electrical circuit will always be dependent on the the voltage and the resistance. When the current flowing throgh a circuit is larger then it can result in heating that damages and burn he resistors or the objects that is present around the circuit.

what type of charge does it have? negative

it becomes positively charged by charging it