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The ability of humans to taste the bitter chemical phenylthiocarbamide (PTC) is a genetic trait

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The ability of humans to taste the bitter chemical phenylthiocarbamide (PTC) is a genetic trait. People with at least one copy of the normal, dominant allele of the PTC gene can taste PTC; those who are homozygous for a mutant, recessive allele cannot taste it.
Which of the following statements is correct?
1.Two non-taster parents can have a taster child.
2.Taster parents will always have 2 copies of the PTC dominant allele.
3.If two non-taster parents had offspring, 1/4 of their offspring would be tasters.  
4.Taster parents can have a non-taster child.

- A. 1, 2, and 3
- B. 1 and 3
- C. 2 and 4
- D. 4 only
- E. All of 1, 2, 3 and 4 are correct.