Courts that use a landmark case as precedent for a decision are (1) using an earlier case as a guide.(2) changing the previous case’s decision.(3) using a third party to review the case.(4) sending the case to a higher court for review.

(1) using an earlier case as a guide.

Explanation:

A court refers to an enclosed space such as a hall or chamber where legal practitioners (judges, lawyers or attorneys and a jury) converge to hold judicial proceedings.

There are different types of courts and these includes;

I. Trial court.

II. Circuit court.

III. Appeal court.

IV. Supreme court.

Legal practitioners such as judges are saddled with the legal responsibility of listening to evidences, facts and thereafter, give a verdict about legal cases based on laws and landmark case.

A landmark case can be defined as an earlier court case that establishes a new law and sets new precedents because of its historical and legal significance. Thus, a landmark case substantially affects how an existing law is interpreted and applied to new court cases.

Some examples of landmark cases around the world are;

I. Kesavananda Bharati Sripadagalvaru & Ors. v. State of Kerala & Anr.

II. Amalgamated Society of Engineers v Adelaide Steamship Co. Ltd.

III. Mahe v Alberta.

IV. McCulloch v. Maryland

V. Law v Canada (Minister of Employment and Immigration).

VI. Tsilhqot'in Nation v British Columbia.

VII. Worcester v. Georgia (1832).

VIII. Gibbons v. Ogden (1824).

This ultimately implies that, courts that use a landmark case as precedent for a decision are using an earlier case as a guide.

the answers is b.   environments.