To identify the grammatically correct sentence, let's analyze each option based on structure, usage of conjunctions, and grammatical consistency:
- The first option is: "Although he had failed in Mathematics, that he received a Degree in Engineering."
- The conjunction "although" establishes a contrast, but here it is incorrectly paired with "that," which creates an incomplete sentence. Thus, this option is incorrect.
- The second option is: "Although, having failed Mathematics, he received the Engineering Degree."
- The sentence uses a comma after "although" unnecessarily. Additionally, the phrase "having failed Mathematics" is awkwardly placed, affecting the flow of the sentence. Hence, this sentence is not appropriately constructed.
- The third option is: "Although, that he failed in Mathematics, but he received a Degree in Engineering."
- This sentence improperly uses both "although" and "but" together, which is redundant. The comma after "although" also disrupts the sentence flow, making it incorrect.
- The fourth option is: "Although he had failed in Mathematics, he received a Degree in Engineering."
- This sentence appropriately uses "although" to introduce a contrast, and it is followed by a complete clause. Therefore, this option is grammatically correct.
- The fifth option is: "Although he failed in that Mathematics, but he received a Degree in Engineering."
- Similar to option 3, using "although" and "but" together creates redundancy. The phrase "failed in that Mathematics" is also confusing and incorrect.
Based on the analysis, the correct sentence is: "Although he had failed in Mathematics, he received a Degree in Engineering."