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(a) is the right answer. We need to replace (1) with (4) and (2) with (3). We need a verb in its base form to fit in the infinitive construction of TO+VERB. DEFT (skilled) is an adjective. PROTECT (to keep safe from harm or injury) is a verb. The first sentence talks about mothers. It states that children are very dear to mothers and they will go to any length to keep them safe. The second sentence talks about how the carpenter was able to use some old boards and make a bookshelf.