Suppose a Cup of Tea Costs $0

Suppose a cup of tea costs $0.60 and a scone costs $1.20. If Edith spends all of her income on these two goods, and at her current level of consumption, she receives a marginal utility of 6 utils from the last cup of tea she buys and a marginal utility of 24 utils from the last scone she buys, then Edith should:

A) buy more tea and fewer scones.
B) buy less tea and more scones.
C) not change her consumption of tea and scones.
D) buy more tea and more scones.