A pair of columns containing three phrases each is presented below. Identify the appropriate combinations that can be joined to form grammatically correct and coherent sentences.

COLUMN I	COLUMN II
(a) When the famous chef opened his new restaurant in the city	(d) you must notify the safety officer at once
(b) Clara loves to display her rare awards in the living room	(e) the inexperienced climbers struggled to reach the base camp before sunset
(c) If an unknown agent attempts to persuade you to sign the contract	(f) so that all her guests can admire her achievements

The correct answer is Only (B)- (F) and (C)-(D).

To form grammatically correct and logically coherent sentences, let us analyze the connections between the phrases in Column I and Column II:

1. Phrase (b) with Phrase (f):
- (b) "Clara loves to display her rare awards in the living room"
- (f) "so that all her guests can admire her achievements"
- Combination (b)-(f): "Clara loves to display her rare awards in the living room so that all her guests can admire her achievements."
- Analysis: This combination is grammatically correct and coherent, explaining the reason why Clara displays her awards.

2. Phrase (c) with Phrase (d):
- (c) "If an unknown agent attempts to persuade you to sign the contract"
- (d) "you must notify the safety officer at once"
- Combination (c)-(d): "If an unknown agent attempts to persuade you to sign the contract, you must notify the safety officer at once."
- Analysis: This forms a complete and logical conditional sentence.

3. Checking other options:
- (a)-(e): "When the famous chef opened his new restaurant in the city, the inexperienced climbers struggled to reach the base camp before sunset." (Unrelated concepts and logically disconnected).
- (a)-(d): "When the famous chef opened his new restaurant in the city, you must notify the safety officer at once." (Grammatically and logically incorrect).

Thus, the correct combinations are (B)-(F) and (C)-(D).