What are the first and last lines in a diamanté poem?
a. adjectives
b. the same
c.1 syllable
d. antonyms

I think A). Adjective

A diamante poem is a poem in which seven lines are formed to appear in the shape of a diamond.

Explanation:

Diamante poems are split into a structure of lines rather than words. They have an odd and strict structure.

1. Noun/subject

2. Two adjectives that describe the noun/subject

3. Words that end with -ing that describe the noun/subject

4. Two words about the first noun/subject and another two words about the antonym/synonym

5. Three -ing words about the antonym/synonym

6. Two adjectives that describe the antonym/synonym
Antonym/synonym of the subject/noun

Here is an example from one of the founders of Shadow Poetry, Marie Summers:

Omit means cleave out .