If the magnetic flux through a certain region is changing with time: a. a current must flow around the boundary
b. a magnetic field must exist at the boundary
c. an electric field must not exist at the boundary
d. an emf must exist around the boundary energy must be dissipated as heat

It's option d. an emf must exist around the boundary

Explanation:

The Faraday's law states that an emf must exist around the boundary whenever there is a change occurring in the flux of a magnetic field.

its c i just checked it

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.