. Which principal part of the verb to dig appears in sentence 4? (A few weeks later, when I was digging up seeds that had not even sprouted yet, Sandy came over to introduce herself with a basket of fresh produce from her garden.)

a. present

b. past

c. present participle

d past participle

To determine which principal part of the verb "to dig" appears in sentence 4, we need to understand the different principal parts of a verb. The principal parts of a verb are forms that can be used to create different tenses and verb forms. In English, the four principal parts of a regular verb are the base form (infinitive), past tense, present participle, and past participle.

Let's analyze the sentence:
"A few weeks later, when I was digging up seeds that had not even sprouted yet, Sandy came over to introduce herself with a basket of fresh produce from her garden."

In this sentence, the verb "dig" is used in the past tense form "was digging." The word "digging" is the present participle form of "dig" and is used to express continuous action in the past.

Therefore, the correct answer is:

c. present participle

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