Determine whether each thesis statement is weak or strong.

a] the number of homeless citizens
in the united states has recently
increased.

b] smoking should be outlawed because
it causes many health problems, such
as breathlessness and lung disease.

c] the jeans industry targets its
advertisements to appeal to
young adults.

d] the invention of vaccinations has
had a major effect on humans by
wiping out a number of deadly
diseases.

[weak thesis statement] [strong thesis statement]