The correct answer is **is shouting** (Option 4). **Comprehensive Derivation:** The correct answer is 'is shouting'. Explanation & Key Takeaways: • From the question we understand that the word to be filled is a verb. • In the options different forms of the verb 'shout' is given. • We need to identify the tense of the given sentence and choose the correct form of the verb and fill. • From the context we understand that a girl is trying to seek the gardener's attention by shouting. • In the sentence 'to gain' is given which is in the present form of tense. • Now, we need to understand what form of present tense it is in. • The sentence isn't in Simple Present as this isn't a habitual action, proverb, commentary, mathematical fact or a planned future. • The sentence is in Present Continuous as it describes a temporary action. • The sentence isn't in Present Perfect Continuous as non of the option carries V_(3) form of verb. • The general form of Present Continuous is - Subject + is/are/am + verb + -ing form. • Hence, option 4 'is shouting' is the correct answer. Therefore, the correct sentence is -'She is shouting at the top of her voice to gain the attention of the gardener'. **Option Elimination:** • **Option 1 (shout)**: Incorrect distractor. • **Option 2 (shouting)**: Incorrect distractor. • **Option 3 (has shouting)**: Incorrect distractor. • **Option 4 (is shouting)**: Correct Answer; accurate according to canonical reference. **Exam Trap:** Be careful of misleading distractors and subtle terminology differences. Verify core properties before selecting your answer. **Memory Booster:** Core mnemonic rule: is shouting corresponds to Option (4).