Final answer:
The word Going needs a helping verb. Helping verbs are used together with the main verb to show the verb’s tense or form a question or negative. In the sentence example, I am going to the park, 'am' is the helping verb and 'going' is the main verb.
Step-by-step explanation:
The question asks: Which of the following needs a helping verb? Already just by looking at the options: A) Going B) Planted C) Thinks D) Ran we can observe that A) Going is the only one that does not work well on its own in a sentence and therefore needs a helping verb. All the other options, B) Planted, C) Thinks, and D) Ran, can act as the main verb in a sentence without needing a helping verb.
Helping verbs, also known as auxiliary verbs, are used together with a main verb to show the verb's tense or to form a question or negative.
For example, in the sentence, I am going to the park, 'am' is the helping verb and 'going' is the main verb. The helping verb 'am' is needed to complement the main verb 'going'.
Learn more about Helping Verbs