The genotype for short plants is generally tt
Answer: Option C
Step-by-step explanation:
According to Mendelian Genetics the tall is a dominant character and short is a recessive character. There are a set of alleles that get expressed to determine each character.
These alleles are in pairs, hence for a tall plant its phenotype is tall even if its genotype is TT or Tt a single allele is enough to express the tallness whereas for a short plant both alleles should be t since it is a recessive character.