Atrait that can possibly mask another trait is known as a
trait.

Dominant trait

There are two types of trait, recessive and dominant.

A phenotype is an individual's observable trait and the genetic contribution to the phenotype is called the genotype which consists of two copies of the allele.

Recessive trait needs two copies of same the allele to express itself whereas dominant trait need only one allele to express itself.

Dominant trait can exist in homozygous or heterozygous form but when in heterozygous pair it will masks the presence of other recessive allele resulting in phenotype of dominant allele/trait.

answer;

c. a tree whose roots are surrounded by wet sand.

explanation;

water stress is an important factor limiting the growth and productivity of forests.water stress is the most often cited cause of poor survival and growth of woody landscape plants.

-insufficient soil moisture is the most common form of water stress, but excess moisture that leads to poor soil aeration (hypoxia) can also result in reduced plant vitality. a tree whose roots are surrounded by wet sand would be least likely to experience water stress.