Multi-choice problem: Continue writing the next sentence in this paragraph:

How to add flaxseed to your diet
Know what to purchase.
Flaxseed is a very small seed that is flat and oval shaped. The seeds are much smaller than sunflower seeds.

Options:
[a]. Almost all people purchasing the seed will buy a similar size of sunflower seeds, but you will only need to buy one or two. Flaxseed seeds come as small boxes or tubs.
[b]. It only needs to be close to the surface to be edible. The seeds should also be small enough that they float.
[c]. It is found in more than one form and each has different properties. Flaxseed comes in red to golden varieties.
[d]. Your choice of flaxseed is important, as very small seeds can be difficult to grow. Spring varieties may make delicious additions to salads or casseroles.
[c].