C. Robert ruined Christmas.
Because Robert was once my friend that turned into enemy.
For example, the words, 'equate', 'destroy', 'belong,' and 'delay' are simple iambic words because the first syllables in each word, 'e, de, be,' and 'de' are unstressed, whereas, the second syllables 'quate, story, long,' and 'lay' are stressed.