This question tests your understanding of verb tenses and sentence structure. The blank (120) requires a verb that correctly completes the sentence in terms of grammar and meaning.

The most suitable verb must agree with the subject and fit the context. The phrase "the most suitable option" implies we are looking for the word that makes the sentence grammatically correct and logically sound.

Without the full sentence, we must analyze the options based on common usage. The words "came", "begin", "start", and "helping" are all verbs or verb forms, but they are used in different contexts and tenses.

• "Came" is the simple past tense of "come".
• "Begin" and "start" are synonyms meaning to initiate an action (present tense or infinitive form).
• "Helping" is the present participle/gerund form of "help".

The correct choice will be the one that fits the specific sentence structure surrounding blank (120).

Related Topics & Theory

Tenses: Verbs change their form to show the time of an action (past, present, future). The correct tense must be used to maintain the timeline of events in a sentence.

Verb Forms: Verbs have different forms like base form (help), past tense (helped), past participle (helped), and present participle (helping). The form used depends on the sentence structure, such as after auxiliary verbs (is helping, have helped).

Key Formulae/Concepts

While there are no mathematical formulae, the grammatical rule for verb agreement is crucial:

Subject-Verb Agreement: A singular subject takes a singular verb. A plural subject takes a plural verb.

Verb Tense Consistency: The tense of the verb must not shift unnecessarily within a sentence or paragraph.