If $$A = \left\{p, q, r, s \right\}$$ then a relation on $$A$$, which is not transitive among the following?

A

$$\theta 1 = \left\{(p,q), (q,s), (p,s)\right\}$$

B

$$\theta 2= \left\{(p, p), (q, q), (r, r) \right\}$$

C

$$\theta 3 = \left\{(p, q), (q, p), (p, p) \right\}$$

D

$$\theta 4 = \left\{(p, q), (r, s) \right\}$$