**Core Concept**
Factor I (Fibrinogen) and Factor H (a regulatory protein in the alternative complement pathway) deficiencies are associated with bleeding disorders and increased susceptibility to infections, respectively. These deficiencies affect the coagulation cascade and the complement system, leading to impaired hemostasis and immune function.

**Why the Correct Answer is Right**
Factor I (Fibrinogen) deficiency, also known as afibrinogenemia, results in the inability to form stable clots due to the absence of fibrinogen. Fibrinogen is converted to fibrin by thrombin, which forms the clot. In the absence of fibrinogen, patients with afibrinogenemia experience spontaneous bleeding and increased bleeding tendency. On the other hand, Factor H deficiency leads to uncontrolled activation of the alternative complement pathway, resulting in excessive complement activation and consumption. This can lead to increased susceptibility to infections, particularly those caused by Neisseria species, such as Neisseria meningitidis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not accurately describe the effects of Factor I and H deficiencies. Factor I deficiency primarily affects coagulation, while Factor H deficiency primarily affects the complement system.

**Option B:** This option is incorrect as it does not accurately describe the effects of Factor I and H deficiencies. While both deficiencies can lead to increased susceptibility to infections, they affect different pathways.

**Option C:** This option is incorrect as it does not accurately describe the effects of Factor I and H deficiencies. Factor I deficiency primarily affects coagulation, while Factor H deficiency primarily affects the complement system.

**Clinical Pearl / High-Yield Fact**
Remember that Factor I (Fibrinogen) deficiency can be inherited in an autosomal dominant or recessive pattern, while Factor H deficiency is usually inherited in an autosomal recessive pattern. Understanding the inheritance patterns of these deficiencies is crucial for genetic counseling and family screening.

**Correct Answer: D**