For the given question, two columns are presented, each containing three phrases. Select the pairs that can be successfully joined to form grammatically correct and logically coherent sentences.

COLUMN I	COLUMN II
(a) The school board decided to implement new policies	(d) to improve student safety across the district
(b) Although the chef spent hours preparing the signature dish	(e) so they want to finish the project by tomorrow evening.
(c) In order to secure a mortgage for the new house	(f) she decided to pursue a degree in mechanical engineering.

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

To determine the correct pair, let us evaluate the given phrases in Column I and Column II for grammatical correctness and logical coherence:

1. Pair (a)-(d):
Column I (a): "The school board decided to implement new policies"
Column II (d): "to improve student safety across the district"
When combined, the sentence becomes: "The school board decided to implement new policies to improve student safety across the district."
This forms a completely grammatical and logically coherent sentence explaining the purpose behind implementing new policies.

2. Pair (b)-(e) / (b)-(f):
Column I (b): "Although the chef spent hours preparing the signature dish"
Column II (e) & (f) mention unrelated subjects/actions (finishing a project by tomorrow evening, pursuing a degree in mechanical engineering). Combining phrase (b) with either results in a sentence that lacks logical connection.

3. Pair (c)-(e) / (c)-(f):
Column I (c): "In order to secure a mortgage for the new house"
Column II (e) & (f) do not logically complete the action required for securing a mortgage (e.g., providing financial proof or meeting with a bank officer).

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