Answer: A) The first word means a part of a plant; the second word means to pursue sneakily.
Step-by-step explanation: the denotation of a word is its literal meaning, the one that we can find in a dictionary (the antonym of denotation is connotation, which is the meaning given by the context of the word), a word can have different denotations. In the given sentence we can see the example of two differents denotations of the word "stalk" in the first sentence, it means a part of a plant and in the second sentence, it means to pursue sneakily.