Replace the bracketed word with one of the given options, which suitably replaces the word without changing the meaning of the sentence:
In the age of technology, smartphones have become (ubiquitous), infiltrating every aspect of our lives, from communication and work to entertainment and even our daily routines.

The correct answer is (d) omnipresent.
Explanation:
"Ubiquitous" means being present everywhere or very common.
Ubiquitous (सर्वव्यापी): ऐसा जो हर जगह मौजूद हो।
Synonyms (समानार्थी): omnipresent, pervasive, universal.
Antonyms (विलोम): rare, scarce, limited.
The synonym of ubiquitous is "omnipresent," which also means existing everywhere.
Meanings of all options:
· Obsolete: No longer in use or outdated.
· Irreplicable: Something that cannot be replaced or copied.
· Candid: Honest or straightforward.
· Omnipresent: Present everywhere at the same time (Synonym of ubiquitous).