When a firm solicits its stockholders for political contributions for a particular candidate by letter and then sends those contributions to the candidate on behalf of its stockholders, it is called:

Lobbying.

Bundling.

Collating.

Constituency building.

Bundling.

Explanation:

Bundling campaign contribution is a form of fund raising involving individuals or group of people like lobbyists, firms, business owners and activists pool together funds for a particular political candidate.

Bundling is also a way to avoid political contribution limits. The limit for an individual contributing for a candidate at the federal level is $2,800. Bundlers can persuade people to contribute at once and get large sums.

The correct answer is letter "B": Bundling.

Explanation:

In politics, bundling refers to the act of pooling small separate campaign contributions into one. Lobbyists are those individuals who act as intermediaries between companies and governmental deputies who receive those contributions. Bundling is the most common method of campaign fundraising.