Please help me with these two question

Debbie is making punch for the company holiday party. She has made 3 gallons and then has an additional 3 quarts. When she arrives at the party the only liquid dispenser is measured in liters. If each dispenser holds 4 liters, how many does she need?
A) 3
B) 4
C) 14
D) 15

A furniture builder who has been commissioned to custom build some bookcases. He goes and measures the space but only had a meter stick with him. finds that the length is 2 meters, the height is 4 meters and the depth is 50 centimeters.

You are to build the shell of the bookcases. You can only buy lumber in 1 inch by 12 inches by 8 feet though. How much lumber do you need to buy?
A) about 8 boards
B) about 11 boards
C) about 39 boards
D) about 40 boards