Answer:
emf = 15 * Area and if A is given in square meters, the units of the emf will be Volts
Explanation:
Assuming that the area of the loop of current (A) is known, the magnitude of the induced emf can be calculated using Faraday-Lenz's Law:

and if the area (A) is given in square meters, the emf will directly come in units of Volts.
The correct answer D: all of the above
i would choose steel because the steel used for normal construction have several hundred Mega Pascal strength. one of the special feature of steel is its ductility. it is the deformation capability before the final breakage.
Heat always transfers from substances with high thermal energy to substances with low thermal until both substances reach the maximum temperature