In the following sentence which principal part of the verb describe appears in italics?

The professor is describing the process of osmosis to the class today.
A.past participle
B.past
C.present
D.present participle
Is the answer D?

I can not see your italics but suspect it is the "ing" and D is correct.

http://en.wiktionary.org/wiki/present_participle

No, the answer is C. "Describing" is the present participle form of the verb "describe" and it appears in the sentence.

Yes, the correct answer is D. "Describing" is the present participle form of the verb "describe" and it appears in italics in the sentence.

To identify the principal part of a verb, you need to understand the different verb forms. In English, verbs have five principal parts: base form, present participle, past, past participle, and third-person singular present.

In this case, we can determine that "describing" is the present participle because it is the continuous or progressive form of the verb and is formed by adding -ing to the base form "describe." It is showing an ongoing action in the present.