Concept:The word “strained” describes a relationship that is under pressure or no longer smooth.
Explanation:The sentence says the couple cannot agree on many things.
This shows their relationship is facing tension and difficulty.
The word “strained” means stretched or forced, which fits a troubled relationship.
“Tensed” is not commonly used to describe a relationship.
“Stressed” usually refers to people or situations, not relationships.
“Uneasy” describes a feeling of discomfort, not the condition of the relationship itself.
Therefore, the best choice is “strained”.
Answer:D. strained