Which of these factors did you include? Check all that a low GDP
an economy based on agriculture
an economy based on a few industries
a low standard of living
a lack of infrastructure
low labor costs

All the factors listed in the question are related to low GDP except for low labor costs:

an economy based on agriculture

Economies based on agriculture tend to have a low GDP, because agriculture usually produces less output than industry and services.

an economy based on a few industries

Economies lacking complexity, most of the time (not always) have a low GDP. An economy based on a few industries is not only vulnerable to shocks, but also likely to be unproductive.

a low standard of living

A low standard of living is directly related to GDP, more specifically, to GDP Per Capita. This is a statistical relationship that has been established by countless economic studies.

a lack of infrastructure

A country that lacks physical infraestructure will usually have a low GDP, because infraestructure is needed to both the production and delivery of goods and services.

according to this text from the preamble to the declaration, who gives men their unalienable rights?