Acovalent bond is likely to be polar if
a. the two atoms sharing electrons are equaly electronegative
b. it is between two atoms that are both very strong electron acceptors
c. the two atoms sharing electrons are of the same element
d. one of the atoms sharing electrons is much more electronegative

The correct answer d. one of the atoms sharing electrons is much more electronegative.

Explanation:

If one of the atoms is more electronegative than the others, like the oxygen in the water molecule, it will allow this atom to attract the other's electrons turning itself into a negative pole and turning the others into a positive pole. In the water, oxygen is more electronegative and that's why it becomes the negative part and the hydrogens become the positive.

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the major parts of the digestive system:

salivary glands.

pharynx.

esophagus.

stomach.

small intestine.

large intestine.

rectum.

accessory digestive organs: liver, gallbladder, pancreas.