tautology, a contradiction, or a contingency.?

Question

educated guess would be aprreciated b/c im lost. please and thank you
Use Quine’s method to classify each of the following formulas as a
tautology, a contradiction, or a contingency.
(a)
(((p ∧ q) → r) ∧ (p → q)) → (p → r)
(b) ((p ∨ q) ∧ (p → r) ∧ (q → s)) → (r → s)

Answer 1

(a) [((p ∧ q) → r) ∧ (p → q)] → (p → r)
Tautology
Because any time p is true, q is also true.

(b) Not a tautology, but not sure what it is.

Answer 2

Tautology Contradiction Contingency