The suffix-ing is usually used to indicate an activity being carried out at the same time or now, so the right answer is A. Now.
The use of -ing in a verb in English is used for all tenses except the simple present tense. The use of this ending also indicates activity (indicating a change in the verb) both in the continuous tense. Continuous tense can also be in the form of a past continuous tense, present continuous tense, and future continuous tense. The definition of the suffix ing is given to a verb (verb) first form.
There are two kinds of use of the word -ing, namely as a present participle and a gerund.
One example of applying the ending ing to the present participle is in the present continuous tense such as she is writing her books in the classroom. A gerund is a compound form of a basic verb ending in ing. Two conditions require us to double the last letter, the first is done when there is a verb consisting of one syllable ending by 1 consonant which first begins with a vowel. For example, if the verb has an E suffix, then if it is added to the -ing suffix the letter E is immediately replaced with the -ing suffix, for example: write becomes writing. For verbs that have the suffix IE, it will change to the letter Y and immediately add the suffix -ing, for example, lie becomes lying. Verbs with the end of the letter EE or with a vowel, the vowels here are like a, i, u, e, o, then the verb with the last letter EE will change too, so the letter EE is retained and then add the suffix -ing after it, example see becomes seeing. The use of the suffix –ing in English is also used in nouns and adjectives.
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