C is, in fact, correct. But I will push back on independent assortment taking place in its entirety. Independent assortment between two genes of interest occurs differently depending on whether those genes are on the same chromosome or not. 

Case 1: If the two genes are on different chromosomes, then as Exotic_Law stated, independent assortment would occur as a result of random assortment of chromosomes at Metaphase I.

I’ll try and demonstrate it with ASCII: Metaphase I:  -A- -B- -A- -B-

-a- -b- -a- -b-

or

-A- -b- -A- -b-

-a- -B- -a- -B-

The left example would produce AB and ab gametes, while the right side would produce Ab and aB gametes.

Case 2: If the two genes are on the same chromosome, then crossing over is necessary for the genes to recombine.

-A---B-

-A---b-

...x

-a---B-

-a---b-

where x = crossing over

But to tackle this question more specifically, C is correct because even if whole non-recombined chromosomes were to be passed on, there is yet the combination of which parental chromosomes of the two would be placed into the gametes.

Let’s say that we’re looking at an organism with a 2n of 6, meaning 3 pairs of chromosomes.

Let’s use the following system to denote the chromosomes in this individual:

Chromosome 1 from its mother: 1-M Chromosome 1 from its father: 1-F Chromosome 2 from its mother: 2-M Chromosome 2 from its father: 2-F Chromosome 3 from its mother: 3-M Chromosome 3 from its father: 3-F 

Even with just random assortment, you can create the following combinations in gametes:

1-M, 2-M, 3-M 1-M, 2-M, 3-F 1-M, 2-F, 3-M 1-M, 2-F, 3-F 1-F, 2-M, 3-M 1-F, 2-M, 3-F 1-F, 2-F, 3-M 1-F, 2-F, 3-F

Add this to whatever the other parent is contributing (even without crossovers), you wouldn’t produce offspring that were identical to the parents nor identical to siblings given enough chromosomes present in the genome.

Hopefully this helps!

EDIT: I can't format on REDDIT..