Ameliorate means to make something better or improve. Options A, C, and D all suggest negative changes.

Pragmatic means practical and realistic. Idealistic (based on ideals rather than reality) is its opposite.

Direct questions within quotation marks should start with a capital letter and end with a question mark inside the quotation marks.

'Ephemeral' means lasting for a very short time. 'Transient' shares this meaning, indicating something temporary or short-lived.

'Prolific' means producing much fruit or foliage or many offspring; highly fertile. 'Scarce' is the opposite, meaning insufficient or rare.

'Ameliorate' means to make something better or improve a situation.

'Obfuscate' means to deliberately make something unclear or obscure, often to confuse or mislead.

'Ubiquitous' means present everywhere at the same time. 'Omnipresent' has the same meaning, relating to being everywhere.

Ephemeral means lasting for a very short time. Transient carries the same meaning of being temporary or short-lived.

Past tense should be consistent throughout. 'walked' and 'bought' both maintain past tense consistency.