PSA Mock Test - 3

Which of these fits gap 18?

Directions: Complete this passage by selecting the most suitable option for the corresponding gap.
The ancients ____(17)_____ the cotton plant the ‘Daughter of the Sun’.
This was _____(18)_______ it was only under the powerful rays of the sun that the plant would grow and flourish.
The hotter the sun, the whiter and stronger _____(19)______ the fibres produced.
Due to these reasons, cotton is _____(20)______ grown in hot and tropical places all over the world.