उस विकल्प का चयन करें जो रेखांकित शब्द को सही ढंग से बदल सकता है। यदि आपको कोई त्रुटि नहीं मिलती है, तो अपने उत्तर के रूप में 'कोई त्रुटि नहीं' चुनें। The authorities erected barricades through the pavements in the vicinity of Buckingham Palace.

Select the most appropriate option to substitute the bracketed segment in the given sentence. If no substitution is required, select 'No Improvement'. When I (become) 11 and learnt to ride a bicycle, my parents decided to buy me one.

An underlined word 'invidious' has been used in three sentences S1, S2 and S3. S1: The invidious child refused to share his toys with the other toddlers. S2: An invidious person is always looking for a way to get revenge. S3: He felt invidious of his brother's success in the military academy. Determine in how many sentences the word has been used correctly.