What is the possible unit for the current VI would be is a petition difference across the resistor and I is a current through the same resister

The unit of potential difference generated between two points is called the Volt and is generally defined as being the potential difference dropped across a fixed resistance of one ohm with a current of one ampere flowing through it. In other words, 1 Volt equals 1 Ampere times 1 Ohm, or commonly V = I*R.

Explanation:

For example, the potential difference (voltage) across a resistor can be found by multiplying its resistance by the current flowing through it. The unit of voltage is the Volt (V). Current is measured in Amperes (A

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

i think the answer is a, hope this is right, that would be my best guess.