D. provided
(The underlined part in "provided" is pronounced with a different vowel sound.)

A. hour
(The "h" in "hour" is silent, while in the others, the "h" is pronounced.)

B. though
(The "th" in "though" is pronounced differently from the others.)

D. agree
(The stress is on the second syllable, while in the others, the stress is on the first syllable.)

C. entertain
(The stress is on the third syllable, while in the others, it is on the first syllable.)