Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : In an experiment, Mendel observed that the F1 progeny plants are all tall and none are dwarf. Reason R : Stem height is a contrasting trait, with tall being dominant and dwarf being recessive. In the light of the above statements, choose the most appropriate answer from the options given below :

1. A. Both A and R are correct and R is the correct explanation of A
2. B. Both A and R are correct but R is not the correct explanation of A
3. C. A is correct but R is not correct
4. D. A is not correct but R is correct

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