<p>It is important to research on recent <span class="ans">developments</span> in wearable technology before making improvements to the design of the smartwatch.</p><div data-answer="d">(A) develop - Incorrect: This is the infinitive form of the verb and does not match the plural noun "developments" that is required in the sentence.<br>(B) develops - Incorrect: This is the present tense form of the verb and does not match the plural noun "developments" that is required in the sentence.<br>(C) developmental - Incorrect: This is the adjective form of the word and does not match the noun form "developments" that is required in the sentence.<br>(D) developments - Correct: This is the correct plural noun form that matches with "in wearable technology" and is required in the sentence.</div>