Select the phrase/connector from the given three options which can be used to form a single sentence from the two sentences given below, implying the same as expressed in the statement sentences.

The country was able to shape this international environment, within its limited powers, in its favour. This was ensured by a series of Indian leaders and bureaucrats.

1. A series of Indian leaders and bureaucrats ensured that

2. Indian leaders and bureaucrats were able to

3. To ensure that the country was able