In the henry experiments, current was produced in a coil by a

The answer is it is produced by static charges.  A current produces a magnetic field. A current appears only if there is relative motion between the loop and the magnet. The current thus created in the loop is called Induced (electromotive force): the work done per unit charge to produce the induced current

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.