Questions

The meanings of the given words are as follows:
Histrionic: excessively theatrical or dramatic in character or style
Melodramatic: characteristic of melodrama, especially in being exaggerated or overemotional
Theatrical: exaggerated and excessively dramatic
Conscientious: wishing to do one's work or duty well and thoroughly
Diligent: having or showing care and conscientiousness in one's work or duties
Tenacious: tending to keep a firm hold of something; clinging or adhering closely
Retentive: (of a person's memory) effective in retaining facts and impressions
Thrive: (of a child, animal, or plant) grow or develop well or vigorously
Tussle: a vigorous struggle or scuffle, typically in order to obtain or achieve something
Pertinent: relevant or applicable to a
particular matter; apposite Appropriate: suitable or proper in the circumstances
Therefore, it can be observed that option  i.e. ‘melodramatic, theatrical’ forms a synonym- synonym pair of ‘histrionic’.

Another name for false productivity is Spinning your wheels. They use the term for false productivity because your wheels are spinning as you're doing work but you're not going anywhere i.e, making any progress.

There is no difference except for the fact that the first one gives a hint that the function fun() is probably in another source file.

Something that saves your money is cost-effective and is also called as economical.

Abu Dhabi (UAE) city has made Hindi as 3rd language in courts.

India ropes in space technology to track border management.