This question is based on the poem “Aunt Jennifer’s Tigers” by Adrienne Rich. The phrase “They pace” refers to the tigers that Aunt Jennifer has embroidered on the panel.
Step 1: Understand the context.
In the poem, the embroidered tigers are described as fearless and confident. The line “They pace in sleek chivalric certainty” clearly indicates that the tigers are moving proudly and confidently.
Step 2: Analyze the options.
(A) The human beings: The poem does not describe humans pacing in this context.
(B) Jennifer's family members: There is no mention of family members pacing.
(C) The tigers: This is correct because the phrase directly describes the embroidered tigers.
(D) The lions: The poem mentions tigers, not lions.
Step 3: Conclusion.
Since the phrase “They pace” refers to the embroidered tigers, the correct answer is (C).
Final Answer:
\[
\boxed{(C) \, \text{The tigers}}
\]