All ______ have to deal with governmental bodies.

The question asks to fill in the blank: "All ______ have to deal with governmental bodies."

Let's analyze the options:

• a) organisations: An organisation is a structured group of people with a particular purpose. This includes businesses, non-profits, charities, educational institutions, and even government agencies themselves. All these entities operate within a legal framework and must interact with governmental bodies for various reasons such as registration, permits, licenses, taxes, regulations, and compliance.
• b) businesses: A business is an organisation or enterprising entity engaged in commercial, industrial, or professional activities. While all businesses certainly deal with governmental bodies (for taxes, regulations, licenses, etc.), "organisations" is a broader term that includes non-profit entities that also deal with governmental bodies.
• c) sundry: Sundry means various or miscellaneous. It is not a type of entity that deals with governmental bodies.
• d) stakeholders: Stakeholders are individuals or groups who have an interest in or are affected by an organisation's actions. This can include employees, customers, investors, communities, and even governmental bodies themselves. While governmental bodies are stakeholders, and other stakeholders might interact with governmental bodies, the term "stakeholders" itself does not fit the blank as the entity that has to deal with governmental bodies in a general sense. It is the organisation that deals with governmental bodies.

Comparing options (a) and (b), "organisations" is a more comprehensive term. All businesses are organisations, but not all organisations are businesses (e.g., a charity is an organisation but not a business). Both businesses and other types of organisations must deal with governmental bodies. Therefore, "organisations" is the most accurate and encompassing answer.

The final answer is $\boxed{\text{a}}$.