To determine the potential drawback of multibranding, we must understand what multibranding actually entails. Multibranding, also known as individual branding, is a marketing strategy where a firm sells different brands in the same category under its larger umbrella. This approach aims to reach different segments of consumers or satisfy varied needs.

Let's analyze the options provided:

1. The company's resources may be spread over too many brands.
2. Consumers may become confused about the image of the main brand.
3. An over-extended brand name might lose its specific meaning for consumers.
4. Different product features can appeal to consumers with different buying motives.

Now, let's evaluate each option in the context of multibranding:

• Option 1: In multibranding, a company manages several brands, which can indeed spread resources thin. Each brand needs its own marketing strategy, budget, and resources. This can be a potential drawback as it may lead to inefficiency or neglect of one or more brands.
• Option 2: Confusion about the image of the main brand usually pertains more to umbrella branding rather than multibranding, as multibranding involves distinct brand identities.
• Option 3: The concern about an over-extended brand name pertains to brand extension rather than multibranding, where a single brand name is used for a wide range of products.
• Option 4: This option discusses a potential benefit of multibranding, wherein different brands under the same company can target different consumer needs and buying motives.

Upon evaluation, Option 1, "The company's resources may be spread over too many brands," accurately describes a potential drawback of the multibranding strategy.

Hence, the correct answer is:

The company's resources may be spread over too many brands.