Read the Paragraph Below and Answer the Questions That Follow

Read the paragraph below and answer the questions that follow.
(1) Some seemingly harmless substances can interfere with the way medicines work inside the body. (2) Take grapefruit juice, for example. (3) It disrupts the action of enzymes that break down drugs in the small intestine before they are absorbed into the bloodstream. (4) Therefore, taking a medication with grapefruit juice may cause the drug to enter the blood in dangerously high concentrations. (5) If this happens, not only is the drug less effective, but serious side effects can result. (6) Many common medications, including antidepressants, antihistamines, and cholesterol drugs, are negatively affected by grapefruit juice.
Select the transitional expression in the paragraph that introduces an illustration:

A) of course
B) for example
C) therefore
D) anyway