The numerous constraints placed on the
members of the First Family has made
it difficult for them to engage in
normal social activities such as going
to the movies.
Correct answer: answer number 4 - has made it difficult to engage in
normal social activities such as going
to the movies.
The original sentence is wrong because
the subject "constrains" is plural and
the verb "has made" is singular. 3 and 5
fail to correct the error. 2 corrects
that error but introduces a new problem
by using the -ing verb instead of the
infinitive.