Matters that require action of both the house and senate, but do not require the power of law or the signature of the president are called
a.
concurrent resolutions.
c.
resolutions.
b.
joint resolutions.
d.
hearings.

Option(a)

Matters that require action of both the House and Senate, but do not require the power of law or the signature of the President are called concurrent resolutions.

Explanation:

Concurrent resolutions require both house approval before being passed. It is used to amend  or make laws that carry the interest of both the house.

They are appointed special letters like “H.Con.Res” and a unique number. Therefore it states that the signature of president is not required for the matters.