In the following question, two columns are provided, each containing three clauses or sentences. Identify the pairs that can be combined to form grammatically correct and coherent sentences.

COLUMN I	COLUMN II
(a) Although the manager tried to inspire the team with a speech	(d) she will monitor the student seating arrangement closely
(b) Whenever the weather changes suddenly in the mountains	(e) he had completed the report before the deadline
(c) Since the professor values discipline during exams	(f) leads to severe delays in transportation services

The correct answer is Only (c)-(d).

Let us analyze the clauses in Column I and Column II to determine which pairs can be logically and grammatically joined to form complete, coherent sentences:

1. Clause (c) and Clause (d):
Column I (c): "Since the professor values discipline during exams"
Column II (d): "she will monitor the student seating arrangement closely"
Combining (c) and (d): "Since the professor values discipline during exams, she will monitor the student seating arrangement closely."
This combination is grammatically correct and forms a logically sound cause-and-effect relationship.

2. Testing other combinations:
- (a) with (e): "Although the manager tried to inspire the team with a speech he had completed the report before the deadline" – This is grammatically incorrect and lacks logical coherence because the conjunction "Although" requires a contrasting action/outcome, not an unrelated past action.
- (b) with (f): "Whenever the weather changes suddenly in the mountains leads to severe delays in transportation services" – The clause starting with "Whenever" acts as a subordinate adverbial clause of time and cannot function as the subject for the verb "leads". Thus, it is ungrammatical.

Therefore, only the pair (c)-(d) forms a grammatically correct and meaningful sentence.