a) A : A catalogue of courses and requirements often confuses students.
B :  A catalogue of courses and requirements often confuse students.

b)  A : Here is the book and the workbook that you will need for this course.
B. Here are the book and the workbook that you will need for this course.

c) A :  Each of the students are studying for the test.
B : Each of the students is studying for the test.

d) A : Not only the students, but also the teacher , is confused by the material.
B : Not only the students but also the teacher are confused by the material.

e) A : Some of the questions seem too hard.
B : Some of the questions seems too hard.

f) A : Next to the cash register was jars for donations for the tsunami victims.
B : Next to the cash register were jars for the tsunami victims.

g) A : Neither of my daughters look like me.
B : Neither of my daughters look like me.

h) A : Many of the headlines in the newspaper seem hard to believe.
B : Many of the headlines in the newspaper seems hard to believe.

i) A : One of my roommates are habitual of leaving dirty dishes under the couch.
B : One of my roommates is habitual of leaving dirty dishes under the couch.

j) A : A duck, three goats and a horse was among the entrants in the pet parade.
B : A duck, three goats and a horse were among the entrants in the pet parade.

Answer : 
a) A
b) B
c) B
d) A
e) A
f)  B
g) B
h) A
i)  B
j)  B