What is the biggest difference between life course theory, on the one hand, and functionalist and conflict theories, on the other?

The biggest difference between the life course theory and conflict theory is that the life course theory seeks to understand the variables that shaped one's life from birth to his time of death while the conflict theory was suggested by Karl Mark and he claims that man is in a state of actual conflict because of limited resources that are available.

Explanation:

The Life course theory was actually formulated in the 1960's for analyzing people's live within structural confines of society and culture.

the conflict theory was formulated by the great Karl Mark and he claimed that social order is maintained by domination and power, rather than consensus and conformity.  

Life course is mainly focused on old age in the context of past experiences while functionalist and conflict theories focus on old age in a more structural context.

Explanation:

Hope it helps a bit. :p

the correct answer would be a.=) have a great day!