'Under the weather' means to feel sick or unwell, commonly used in healthcare contexts.

'Call it a day' means to stop working or finish an activity for the day, often used when tired or finished.

'Caught red-handed' means caught while committing a crime, not used with 'in a web of deceit' - should be used independently.

The sentence correctly uses both idioms: 'seeing eye to eye' (agreeing) and 'call off' (cancel). The grammar and usage are appropriate.

'Hit the nail on the head' (idiomatic) means to identify or express something correctly. Option B uses it figuratively and correctly.

Using both 'cut their losses' and 'pull the plug' is redundant as both convey stopping/ending something. Choose one idiom.

'Bury the hatchet' specifically means to end a conflict and make peace, perfect for rivals reconciling.

The correct phrase is 'take the bull by the horns' (without 'its'). Option D uses incorrect grammar within the idiom.

All three idioms convey collaborative effort and alignment in modern business communication.

'The writing is on the wall' means an outcome is inevitable and obvious, though perhaps not yet formally declared.