Connective tissue: holds the heart in place while the body moves
muscle and nervous tissue: pump the heart
epithelial tissue: protects the heart from the damage other parts can do
I think it has something to do with their polar-nonpolar makeup. They have a polar head and a nonpolar tail. Only the polar side bonds with water, so they form two layers so that the polar sides can stick out and bond with the water, while the nonpolar tails can face each other. Imagine this:
p------n n------p
p------n n------p
And outside the double layer are water molecules bonding with the polar part:
wwww p------n n------p wwww
<span>wwww p------n n------p wwww
</span>
I believe the answer is A. Hope this helps