Which of mendel’s laws states that an organism with two different alleles will express

c. Law of Dominance

If one trait will for sure be dominant then the other choices don't make sense.

 c. Law of Dominance  

Law of dominance is the law proposed by Gregor Mendel. It suggests that when an offspring inherits a heterozygous pair of allele. The allele that is dominant over the two will be expressed in the offspring, and the offspring will acquire the trait, according to the expressed dominant allele. The dominant allele will mask the effect of recessive allele, and the recessive allele will not be expressed.