Tell Whether the Relation Is Reflexive, Symmetric, or Transitive on the Set

Multiple Choice

Tell whether the relation is reflexive, symmetric, or transitive on the set of all people. Also tell whether the relation is an equivalence relation.
-"Is thinner than"

A) Transitive; not an equivalence relation
B) Reflexive and transitive; not an equivalence relation
C) Symmetric and transitive; not an equivalence relation
D) Symmetric; not an equivalence relation