When an instructor listens carefully to your question in class, he or she is using acknowledgment.
The instructor is acknowledging that you are speaking and that you are interesting in knowing the answer to your question. He or she is not irritable, but rather patient with you and listens without interrupting you.
Explanation:
D is the answer brother trust me on this best if luck
Promotion investment
promotion of exports
Investment in infrastructure
An act to provide for the general welfare by establishing a system of Federal old-age benefits, and by enabling the several States to make more adequate provision for aged persons, blind persons, dependent and crippled children, maternal and child welfare, public health, and the administration of their unemployment.