Select the most appropriate option that can substitute the underlined segment in the given sentence.

Explanation:

The sentence means that the cousin works continuously, day and night, to achieve success in life.
The idiom "around the clock" means all day and all night; continuously without stopping.
So, the correct sentence is:
My cousin works around the clock to achieve success in life.
Hindi: मेरा चचेरा/ममेरा भाई जीवन में सफलता प्राप्त करने के लिए दिन-रात लगातार मेहनत करता है।

Meaning of the options:

• around the clock – all day and night; continuously (दिन-रात लगातार)
• great dealing – not a correct idiomatic expression in this context.
• vale of tears – a life full of suffering and sorrow (दुःखों से भरा जीवन).
• a handful – a person who is difficult to manage (संभालने में कठिन व्यक्ति).

Answer : around the clock – all day and night; continuously (दिन-रात लगातार)