The correct option is D 4
The characters which Mendel chose were located on 4 chromosomes.
Chromosome 1 - Seed coat colour and cotyledon
Chromosome 4 - Position of flower, form of pod and stem length
Chromosome 5 - Pod colour
Chromosome 7 - Form of seed.
Luckily all the characters which Mendel chose were having their genes located on different chromosomes. Law of independent assortment will not work in all situations because the heredity units will be passed to the next generation as a pair, and not independently.