I accept your plan.
Choose the word/phrase which is opposite in meaning to the italicized word/phrase in the sentence.
A) deny
B) admit
C) reject
D) decline

Hint: An antonym is a word that means the exact opposite of another. 'Fresh,' for example, might be an antonym for 'old.' The terms 'anti' and 'onym,' which respectively mean 'against' and 'opposite,' are combined to produce the phrase 'antonym.' Synonyms and antonyms are synonyms and antonyms, respectively. Synonyms are similar but not identical terms to antonyms.

Complete answer:
The term 'accept' is to agree to receive or do something.
Let us look at the given options:
A) Option A, deny, relates to refusing to provide someone what they have asked for. This option is incorrect because it is not an antonym for ‘accept’.
B) Option B, admit, refers to admitting something to be true or correct. This option is incorrect because it is not an antonym for ‘accept’.
C) Option C, reject, refers to discarding anything as insufficient, unsatisfactory, or defective. As a result, the meaning of the term 'reject' is the polar opposite of that of the word 'accept.'
D) Option D, The term "decline" refers to the process of becoming smaller, fewer, or less. This option is incorrect because it is not an antonym for ‘accept’.

Thus, the correct answer is Option C) reject.

Note: A term with several meanings is called an antonym. The content of the relationship between the opposing meanings distinguishes three different types of antonyms. The phrases do not form a continuous continuum, and the terms have no other lexical relationship, therefore they are complementary antonyms. Relational antonyms are two meanings that are only opposed in the sense of their relationship.